List of Transformers: Robots in Disguise (2000 TV series) characters
This is a list of characters from the 2000 anime series Transformers: Robots in Disguise. The series focuses on two warring species of transforming robots from the planet Cybertron, the Autobots and Predacons.

Autobots
The Autobots are alien robots from the planet Cybertron who came to Earth to pursue the Predacons and assume various vehicular disguises while operating on the planet.

Commanders
Omega Prime, or "God Fire Convoy" in Japan, is the combiner forced fusion of Optimus Prime and Ultra Magnus as Matrix. In battle, he can flying and uses the Ultra Magnus's weapon of Lazer and Galting on shoulders to shooting the enemies. Later, Fortress Maximus giving the Matrix Blade to defeat the Galvatron. Omega Prime is voiced by Daniel Riordan (U.S.) and by Satoshi Hashimoto (Japan).
Optimus Prime, or "(Super) Fire Convoy" in Japan, is the leader of the Autobots who possesses a Matrix to symbolize his authority, transforms into a fire truck, and can assume a super mode. Later in the series, he gains the ability to combine with his brother Ultra Magnus to become Omega Prime. Optimus Prime is voiced by Neil Kaplan (U.S.) and by Satoshi Hashimoto (Japan).
Ultra Magnus, or "God Magnus" in Japan, is Optimus Prime's embittered and violent brother who transforms into a car carrier truck and became jealous of the latter after being passed over for leadership of the Autobots and now seeks to claim Optimus' Matrix for his own, believing it is rightfully his. In pursuit of this goal, Ultra Magnus comes to Earth, grants the Autobot Brothers extra power, and attempts to steal Optimus' Matrix, only to gain the ability to combine with him into Omega Prime.Ultra Magnus is voiced by Kim Strauss (U.S.) and by Takashi Matsuyama (Japan).

Autobot Brothers
Autobot Brothers are three-man of Autobots, who both transform into the vehicle cars mode, Later giving by Ultra Magnus the Super changing color mode.
X-Brawn, or "Wildride" in Japan, is eldest and most reliable of the three Autobot Brothers who can transform into a SUV. He loves extremes, lives for the thrill, can handle any type of environment, and traverse tough terrains. In battle, he is a master in martial arts, possesses super-strength in his left arm, and a winch in his vehicle mode capable of pulling him up buildings. X-Brawn is voiced by Bob Joles (U.S.) and by Masahiro Shibahara (Japan).
Prowl, or "Mach Alert" in Japan, is the strict middle sibling of the Autobot Brothers who can transform into a Lamborghini Diablo police highway pursuit vehicle. In battle, he wields two missile launchers which become thrusters in his vehicle mode.Prowl is voiced by Wayne C. Lewis (U.S.) and by Takayuki Kondo (Japan).
Side Burn, or "Speedbreaker" in Japan, is the courageous yet impulsive youngest sibling of the Autobot Brothers who can transform into a Dodge Viper and possesses the most speed out of his brothers. Side Burn is voiced by Wally Wingert (U.S.) and by Punch UFO (Japan).

Team Bullet Train
Team Bullet Train is a three-man team of Autobots who all transform into the engines of their team's namesake and can link up in their vehicle modes and combine in their robot modes to form Rail Racer ("JRX" in Japan) [voiced by David Lodge (U.S.) and Shōji Izumi (Japan)].
Railspike, or "J5" in Japan, is the courageous, intelligent, and grizzled leader of Team Bullet Train who can transform into a 500 Series Shinkansen Nozomi bullet train engine. He serves as a peacekeeper when his teammates get out of hand and, despite his age, is skilled and efficient in combat. In battle, he possesses shoulder-mounted rocket launchers, generate ultrasonic waves, and fire "Reflector Mines". Railspike is voiced by Mike Reynolds (U.S.) and by Shōji Izumi (Japan).
Rapid Run, or "J7" in Japan, is an eager, sarcastic, and cool-headed member of Team Bullet Train who transforms into a 700 Series Shinkansen Hikari Rail Star bullet train engine. In battle, he possesses the most strength, can generate a force-field, and wields a rifle and shield. Rapid Run is voiced by Keith Diamond (U.S.) and by Eiji Takemoto (Japan).
Midnight Express, or "J4" in Japan, is the youngest member of Team Bullet Train who can transform into an E4 Series Shinkansen engine. He is known for being cheerful and friendly around friends and harsh with enemies. In battle, he possesses incredible strength, can endure cold weather, fire high temperature missiles, and generate solid light blades from his shoulders. Midnight Express is voiced by David Lodge (U.S.) and by Naomi Matamura (Japan).

Spy Changers
A team of six Autobot espionage specialists capable of driving on almost any surface, turning invisible, and phasing through solid objects.
Hot Shot, or "Artfire" in Japan, is the leader of the Spy Changers who has fought alongside Optimus Prime for many years and transforms into a Porsche 959 sports car. He outwardly displays a gruff, no-nonsense exterior, but will put the safety of his teammates above all else. In battle, he possesses fire-based attacks. Hot Shot is voiced by Michael McConnohie (U.S.) and by Eiji Takemoto (Japan).
R.E.V. (Race Exertion Vehicle), or "Eagle Killer" in Japan, is the Spy Changers' tactical officer who can transform into a Lamborghini Diablo. In battle, he possesses incredible leaping capabilities. R.E.V. is voiced by Steve Kramer (U.S.) and by Chōtomi Nimura (Japan).
Crosswise, or "X-Car" in Japan, is the Spy Changers' science officer who can transform into a blue "concept car" with an exposed rear engine. He specializes in space engineering, developing new inventions, and maintaining the other Autobots. In battle, he wields an anti-gravity gun. Crosswise is voiced by Dan Woren (U.S.) and by Junichi Miura (Japan).
W.A.R.S. (Wicked Attack Recon Sportscar), or "Wars" in Japan, is a bold and daring yet violent member of the Spy Changers who can transform into a Ford Thunderbird NASCAR stock car. In battle, he possesses heavy armor and wields a machine gun. W.A.R.S. is voiced by Steve Blum (U.S.) and by Riki Kitazawa (Japan).
Ironhide, or "Ox" in Japan, is the Spy Changers' peaceful yet irascible transport expert who transforms into a Ford F150 Flareside pickup truck. Despite being one of the youngest members of the group, he is a battlefield veteran and longtime friend of teammate Mirage. In battle, Ironhide possesses the most strength of the Spy Changers and wields a shockwave rifle. Ironhide is voiced by Michael McConnohie (U.S.) and by Eisuke Yorita (Japan).
Mirage, or "Counter Arrow" in Japan, is the Spy Changers' marksman who prefers to be alone and can transform into a Lola T94 Indy car. Mirage is voiced by Wally Wingert (U.S.) and by Ryō Naitō (Japan).

Build Team
The Autobots' construction experts who initially maintained their Global Space Bridge network before being promoted to a combat role later in the series and can combine into Landfill ("Build King" in Japan)
Wedge, or "Build Boy" in Japan, is the young, hot-headed, and reckless leader of the Build Team and the Autobots' chief architect who transforms into a bulldozer. In battle, he possesses an almost limitless energy reserve and wields a double-barrelled beam gun. Wedge is voiced by Michael Reisz (U.S.) and by Yukiko Tamaki (Japan).
Heavy Load, or "Build Typhoon" in Japan, is the strongest and most durable member of the Build Team who can transform into a dump truck. He serves as Wedge's personal aide and martial arts instructor. In battle, Heavy Load wields a claw-like weapon and is an expert in several forms of martial arts. Heavy Load is voiced by Daran Norris (U.S.) and by Yoshikazu Nagano (Japan).
Hightower, or "Build Cyclone" in Japan, is the Build Team's firearms expert and Wedge's personal bodyguard who can transform into a crane truck. In battle, Hightower wields a flamethrower, two pistols, and a cannon. Hightower is voiced by Joe Ochman (U.S.) and by Masami Iwasaki (Japan).
Grimlock, or "Build Hurricane" in Japan, is Wedge's calm and sunny second-in-command who can transform into an excavator. Despite being a seasoned warrior, Grimlock has a tendency for becoming deep in thought while judging fights and determining how best to relay combat advice to Wedge. In battle, he possesses two pincers on each hand and can convert his excavator arm into a grabber-like weapon. Grimlock is voiced by Tom Wyner (U.S.) and by Hiroki Takahashi (Japan).

Fortress Maximus
Fortress Maximus, or "Brave Maximus" in Japan, is a Cybertronian battle station hidden on Earth in order to protect it. His activation keys - the O-Parts, the Orb of Sigma, and a small robot called Cerebros ("Plasma" in Japan) that forms his head via an intermediary robot called the Emissary ("Brave" in Japan) - were scattered across the planet and hidden within ancient structures. While a group of Autobot protoforms were sent to recover him sometime prior to the past, they fell into stasis and Fortress Maximus went undiscovered until the present when the Autobots and Predacons' battle led to their locating the giant Cybertronian. Fortress Maximus and Cerebros/Emissary are voiced by Steve Blum and Steve Kramer respectively and by Masayuki Kiyama (Japan).

Minor Autobots
 Skid-Z, or "Indy Heat" in Japan, is an Autobot who scanned the race car of human racecar driver, Augie Cahnay, for his vehicle mode, but ended up absorbing Cahnay's psychotropic energy and developing an uncontrollable desire to enter any race he can find. Skid-Z is voiced by Michael Lindsay (U.S.) and by Jin Nishimura (Japan).
Tow-Line, or "Wrecker Hook" in Japan, is an Autobot obsessed with making sure people and robots only park in the right spots. Tow-Line is voiced by Lex Lang (U.S.) and by Masami Iwasaki (Japan).

Predacons

Main Predacons
The Predacons, similarly to the Autobots, are aliens from the planet Cybertron who can transform into robotic animals and came to Earth to seek the power of Fortress Maximus for nefarious means.
Megatron, or "Gigatron" in Japan, is the merciless leader of a small group of Predacons who wrought destruction across most of the universe and was sent by a Predacon Council to Earth to steal its energy and obtain Fortress Maximus. After kidnapping, Dr. Kenneth Onishi, an energy expert who discovered most of Fortress Maximus' activation keys, Megatron tasks his Predacons with furthering their mission while he watches their progress from his ship, the Megastar. After uncovering the Orb of Sigma, its power turns Megatron into the energy vampire Galvatron ("Devil Gigatron" in Japan). Using his new powers, he battles the Autobots until he is defeated by Omega Prime and captured to be brought back to Cybertron. As Megatron, he can transform into a bat (Gigabat), twin-headed dragon (GigaDragon), jet (GigaJet), car (GigaFormula), and claw (GigaHand). After becoming Galvatron, he gains vampiric powers and the additional ability to transform into a hydrofoil, griffin, Pteranodon, and elephant. Megatron/Galvatron is voiced by Daniel Riordan (U.S.) and by Yōichi Kobiyama (Japan).
Sky-Byte, or "Gelshark" in Japan, is Megatron's devoted yet comical second-in-command who desires his leader's attention, has a love of poetry, and can transform into a robotic shark. He attempts to lead his fellow Predacons in achieving Megatron's goals, only for his own plans to comically backfire. Following the Decepticons' creation, a jealous Sky-Byte goes to greater lengths to prove his worth to Megatron. However, this culminates him saving a group of civilians he intended to take hostage and accidentally freeing the Predacons' human captive, Dr. Kenneth Onishi. In light of these events, Sky-Byte is mistaken for a hero by and gains admiration from human children, which he eventually comes to accept. While the Autobots defeat, capture, and return the Predacons to Cybertron, Sky-Byte secretly escapes into Earth's oceans. In battle, Sky-Byte can fire missiles, fly, and burrow underground in his beast mode and wields blades and a rotating claw for a left hand in his robot mode. Sky-Byte is voiced by Peter Spellos (U.S.) and by Konta (Japan).
Slapper, or "Gusher" in Japan, is a Predacon foot soldier and hacker who serves as Sky-Byte's second-in-command, has a tendency for speaking his mind without thinking ahead, and can transform into a frog. In battle, Slapper possesses incredible leaping capabilities and a whip-like tongue in beast mode and a grabber claw and the "Right Laser" in robot mode. Slapper is voiced by Peter Lurie (U.S.) and by Ryō Naitō (Japan).
Gas Skunk, or "Gaskunk" in Japan, is a snobbish and conceited Predacon demolitions expert and technical specialist who transforms into a skunk. In battle, he can emit acid and wields a serrated tail in beast mode and fire time bombs from his right shoulder, emit gas from his mouth capable of causing uncontrollable laughter, and fire the "Left Laser" in robot mode. Gas Skunk is voiced by Jerry DeCapua (U.S.) and by Norio Imamura (Japan).
Darkscream, or "Guildor" in Japan, is a flamboyant Predacon foot soldier with a fascination for samurai and swashbuckler dramas who transforms into a Japanese giant flying squirrel. In Car Robots, he speaks in feudal "de gozaru" style Japanese. In battle, he wields an Energon sword, can produce an electromagnetic cloaking field, is mute while in flight, can become invisible in low light and shadowy environments, can fire the "Center Laser", and possesses competent fencing and swordsmanship skills. Darkscream is voiced by Steve Blum (U.S.) and by Hiroki Takahashi (Japan).

Decepticons
The Decepticons, or "Combatrons" in Japan, are formerly six Autobot protoforms who were put into stasis and sent to Earth to find Fortress Maximus, only for their ship to crash in the mid-20th century. In the present, Megatron locates and reprograms them to serve him and bolster his forces.
Scourge, or "Black Convoy" in Japan, is the leader of the Autobot crew turned leader of the Decepticons who can transform into a tanker truck and resembles a dark version of Optimus Prime after Megatron made Scourge scan a tanker truck and the Autobot leader simultaneously. Scourge initially serves Megatron loyally. However, using his the ability to detect the O-Parts' energy signatures, Scourge set about locating and using Fortress Maximus in an attempt to overthrow Megatron, only to be foiled by several programming blocks that prevent Fortress Maximus from being used for evil before Galvatron reprogrammed Scourge back into line. Following Galvatron's defeat, Scourge is captured and taken back to Cybertron to face justice. Scourge is voiced by Barry Stigler (U.S.) and by Taiten Kusunoki (Japan).
The Commandos are Decepticon soldiers who can combine to form the giant robot Ruination ("Baldigus" in Japan) [voiced by Bob Papenbrook (U.S.) and by Holly Kaneko (Japan)], with Movor and Ro-Tor granting Ruination flight capabilities when they form the arms while Armorhide and Rollbar grant extra strength.
Mega-Octane, or "Dolrailer" in Japan, is the cool-headed, calculating, and cruel leader of the Commandos who displays no tolerance for failures, is not above treating his subordinates like his limbs, and can transform into a self-propelled artillery truck and a combat station. In vehicle mode, he can fire missiles, wields a laser rife in robot mode, and perform maintenance on his teammates in station mode. Mega-Octane is voiced by Bob Papenbrook (U.S.) and by Holly Kaneko (Japan).
Armorhide, or "Dangar" in Japan, is a loud, boastful Commando who specializes in desert warfare and can transform into a Leopard 1 tank. Armorhide is voiced by Richard Epcar (U.S.) and by Takayuki Kondo (Japan).
Movor, or "Shuttler" in Japan, is a pompous Commando who can transform into a combat space shuttle. He is capable of flying, achieving planetary orbit, possesses powerful detection equipment, excellent heat resistance, and wields a long-range X-Ray laser. Movor is voiced by Robert Axelrod (U.S.) and by Hidenori Konda in (Japan).
Rollbar, or "Greejeeper" in Japan, is a sarcastic Commando skilled in hand-to-hand combat who can transform into a FMC XR311 combat support vehicle. Rollbar is voiced By Michael Lindsay (U.S.) and by Riki Kitazawa (Japan).
Ro-Tor, or "Hepter" in Japan, is the Commandos' reconnaissance expert who transforms into a Kaman SH-2 Seasprite. Ro-Tor is voiced by Neil Kaplan (U.S.) and by Masao Harada (Japan).

Recurring characters

Main
 Koji Onishi ("Yuuki Onishi" in Japan): The son of Doctor Kenneth Onishi who allies himself with the Autobots to find his father after he is kidnapped by Megatron. While providing advice and knowledge of Earth to the Autobots, Koji later discovers he can control Fortress Maximus. Koji Onishi is voiced by Jason Spisak (U.S.) and by Akiko Kimura (Japan).
 T-AI ("Tactical-Artificial Intelligence"): A sentient computer program who runs operations for the Autobots from their headquarters and takes the form of a young human woman in a pink uniform. T-AI is voiced by Sandy Fox (U.S.) and by Chieko Higuchi (Japan).
 Doctor Kenneth Onishi ("Daichi Ōnishi" in Japan): An archaeologist and father of Koji Onishi whose research eventually led him to the locations of Fortress Maximus' activation keys. Due to this, Megatron kidnaps Dr. Onishi and probes his mind for the information before Dr. Onishi is eventually freed and lends his aid to the Autobots. Dr. Onishi is voiced by Kirk Thornton (U.S.) and by Shouji Izumi (Japan).

Others
 Dorie Dutton: A news reporter who frequently covers the Transformers' battles. Dorie Dutton is voiced by Tifanie Christun (U.S.) and by Mariko Nagahama (Japan).
 Kelly Shiragami ("Junko Shiragami" in Japan): A hapless young woman who owns X-Brawn's vehicle disguise and always seems to find herself caught in the crossfire of the Transformers' battles. Kelly Shiragami is voiced by Philece Sampler (U.S.) and by Chieko Higuchi (Japan).

Notes

Lists of anime and manga characters
Robots in Disguise