Because you like Roy Mustang in Fullmetal Alchemist
Ezio Auditore Da Firenze is a little short-tempered, a lot fun-loving. See them in Assassin's Creed Series.
Resourceful and courageous, Chun-Li is dedicated to using her considerable strengths against evil. See them in Street Fighter.
Donkey Kong is a strong, banana-loving, and caring uncle to Diddy Kong. See them in Donkey Kong.
Gruff and efficient, Sam Fisher protects a nation that can never admit he exists. See them in Tom Clancy's Splinter Cell.
Marv is a brutish but principled thug who'd be right at home on an ancient battlefield. See them in Sin City.
Altair Ibn-La'Ahad is as much a philosopher and detective as he is a killer. He takes nothing at face value and continually searches for deeper truths. See them in Assassin's Creed Series.
Sarah Kerrigan is pretty much the Queen Bitch of the Universe. See them in StarCraft .
NiGHTS is a powerful but childlike spirit who hates being told what to do. See them in NiGHTS into Dreams.
A fun-loving jokester, Alistair isn't ready for the responsibilities he faces. See them in Dragon Age Series.
Artemis Fowl understands the way of the world. If he wins, he's a prodigy. If he loses, then he's crazy. That is how history is written. See them in Artemis Fowl.
Raz is a 10-year-old boy who mostly stays in his own head, which makes sense since that's where he is strongest. See them in Psychonauts.