Because you like Brain in Pinky and the Brain
Lily Aldrin is a flaky but supportive kindergarten teacher and painter. See them in How I Met Your Mother.
Mike Hannigan is a lawyer-turned-pianist who loves to tap into his kooky side. See them in Friends.
Javert is an inspector with a single-minded focus: to bring criminals to justice. See them in Les Miserables.
Ahsoka Tano hopes to be a very powerful and knowledgeable Jedi one day. See them in The Clone Wars.
Ultron is security software turned evil mastermind. See them in Marvel Cinematic Universe.
Roger is a pansexual alcoholic non-human who will happily lie, cheat and steal to get what he wants. See them in American Dad!.
Frederick Frankenstein is an eccentric (O.K., maybe a little insane) professor who is excited to be delving into his family's past. See them in Young Frankenstein.
Sydney Bristow is a kick-ass double agent on a mission for revenge. See them in Alias.
Leslie Burke is bold, courageous, and imaginative enough to create a world from scratch. See them in Bridge to Terabithia.