Because you like Lucy Pevensie in The Chronicles of Narnia
Brilliant, violent, and only a little insane, the Joker doesn't listen to anyone except the voices in his head. See them in DC Extended Universe.
The Terminator is an emotionless killing machine who won't stop until he's changed the future. See them in The Terminator.
Greenpeace? No, this brave eco-terrorist is waging Greenwar. See them in Final Fantasy Series.
An arrogant, prideful human-demon hybrid, Inuyasha secretly just wants to be accepted. See them in Inuyasha.
If anyone can stay optimistic and friendly under harsh alien rule, it's Alyx Vance. See them in Half-Life 2.
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.
Amber Holt is perpetually caught between forging her own path and stumbling around in the dark. See them in Parenthood.
Shrek is a nasty-on-the-surface ogre with a heart of gold and an earful of wax. See them in Shrek.
A gentle alchemist who is soul-bound to a giant suit of armor, Alphonse Elric is growing into the responsibility handed to him. See them in Fullmetal Alchemist.
For Sly Cooper, stealing isn't just about the haul. It's also about the journey. See them in Sly Cooper.