DuckTales
When Donald Duck decides to join the US Navy, he enlists his uncle Scrooge McDuck to look after his nephews, Huey, Dewey, and Louie. Although reluctant to do so due to their hyperactivity, along with his continual pursuit of increasing his wealth and maintaining harsh business ethics, he eventually warms to them upon seeing how smart and resourceful they are, and takes them into his manor as well as a number of adventures. In addition to them, the show features frequent appearances by Gyro Gearloose, an established comic book character, as well as guest appearances by Donald in the first season – this was either a full appearance, or in a cameo scene when Scrooge and his nephews read letters he sends to them, and a few minor appearances by Scrooge's old flame, Glittering Goldie, whose character was adapted from the comic books. The show introduced new characters to the Duck universe; while some were minor including: the nanny Mrs. Beakley, whom Scrooge hires to babysit the nephews; Mrs. Beakley's granddaughter Webby; Scrooge's pilot Launchpad McQuack; Doofus Drake, an admirer of Launchpad and a close friend of the nephews; and the McDuck Manor butler, Duckworth. The second season later introduced three new additional characters as part of the show's stories: "caveduck" Bubba Duck and his pet triceratops Tootsie; and Fenton Crackshell, Scrooge's personal accountant who secretly works as a superhero named Gizmoduck.
Beagle Boys
Scrooge first met the modern third generation Beagle Boys during Christmas 1947, which was when he first met his grandnephews Huey, Dewey and Louie and met his nephew Donald Duck for the second time. Since then the Beagle Boys have been a constant threat to Scrooge's Money Bin.
The third generation of the Beagle Boys, like their fathers, were never given any personal names by Carl Barks but was instead referred to by their prison numbers, which starts with "176-" and ends on a permutation of the numbers 1, 6 and 7, which allows six different combinations. This tradition was first established in Barks' "The Menehune Mystery" (Uncle Scrooge #4, December 1953), while the Beagle Boys in previous stories, and some of them in "The Menehune Mystery," instead had their prison numbers as "176-" followed by random digits (except in their first story, where they have no prison numbers). However, in a few of his later stories Barks didn't continue this tradition and used random numbers again instead, but subsequent writers and artists by default still mostly uses the 1, 6 and 7 combinations for the Beagle Boys in the modern comic books. The Beagle Boys also have their prison numbers tattooed on their chests. According to Don Rosa's "The Beagle Boys vs. The Money Bin" (2001), the Beagle Boys have been known by their prison numbers since their childhood, and they don't even know their real names themselves. Their parents do know their real names, but demand a bribe from their sons to let them know. Also according to that story, Blackheart Beagle doesn't remember his sons' names.