Playable character in [[Honkai: Star Rail]].

His Chinese name 真理医生 can be translated as Dr. Reason. Much like [[Dan Heng (Imbibitor Lunae) (Honkai: Star Rail)|"Imbibitor Lunae"]], Dr. Ratio's name is also taken from Latin, with "Ratio" meaning "Reason".

In some languages of the game, his name is Dr. Truth instead, which is an [i]acceptable[/i] translation though "Truth" is generally shown as 真相 and not as 真理 which is what they use for his name. According to early leaks, his name was originally going to be "Doctor of Truth".

His full name is [spoiler]Veritas Ratio[/spoiler], which is Latin for [spoiler]Truth Reason[/spoiler].

h4. Profile
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"The most annoying thing about idiocy is that you can't explain it to an idiot."

A candid and self-centered Intelligentsia Guild member, who often conceals his appearance with a strange plaster sculpture. He demonstrated unparalleled intelligence and talent since his youth, but now refers to himself as a "Mundanite."

He firmly believes that intellect and creativity are not confined to geniuses. He seeks to distribute knowledge to the entire universe to cure the persistent disease named ignorance.
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