Because you like Seto Kaiba in Yu-Gi-Oh!
Kenzo Tenma would have never guessed that ten-year-old he saved would later become a deadly serial killer intent on "thanking" him. See them in Monster (TV Show).
Greenpeace? No, this brave eco-terrorist is waging Greenwar. See them in Final Fantasy Series.
It turns out Dracula's son Alucard has some pretty severe daddy issues. See them in Castlevania.
For the sake of science, Kurisu Makise will persevere no matter how deep into the dark secrets of the world she finds herself. See them in Steins;Gate.
Closing off her emotions makes Lightning a great fighter, but at what personal cost? See them in Final Fantasy Series.
Dante Alighieri is a crusader fighting his way to absolution. See them in Dante's Inferno.
Edward Elric has a quick mind along with a quick temper. See them in Fullmetal Alchemist.
Everyone is just a chess piece, and Izaya Orihara is a master player. See them in Durarara!!.
For Celty Sturluson, it's rather upsetting to be the only headless girl in a city filled with full-bodied humans. See them in Durarara!!.
Resourceful and courageous, Chun-Li is dedicated to using her considerable strengths against evil. See them in Street Fighter.
They say they saved Adam Jensen by turning him into a cyborg, but he's not sure saved is the right word. See them in Deus Ex Series.
What Mako Mankanshoku lacks in common sense, she makes up for in sheer optimism and force of personality. See them in Kill la Kill.