Kung Fu Brian is basically a cheap edit of Kung Fu Man. Only internal workings have been changed, so visually, he appears the same.
In M.U.G.E.N, Kung Fu Brian has been made by GermanyHDGaming, a German YouTuber.
A relatively simple edit of Kung Fu Man, all that's changed are his velocities and stats, which have been increased (with the exception of his Life stat, which has been decreased). As such, he is able to jump very high making it easier for him to attack his enemy while airborne, and run at an insanely high speed so that the player can't even see him while doing so.
Hovering the mouse cursor over the Command Input icons will display text that refers to the inputs set in M.U.G.E.N's Key Config.
Icons encased in square brackets [ ] require the respective button(s) to be held down. Hovering the mouse cursor over the gap displays the hold duration if applicable.