Because you like Cosmo Kramer in Seinfeld
If Lisbeth Salander can hurt a bastard who deserves it by digging up stuff about him, she feels good. See them in The Girl with the Dragon Tattoo.
Taking down villains, standing up to sexism, and pulling off a bright-red lipstick are all in a day's work for Agent Peggy Carter. See them in Marvel Cinematic Universe.
John Tyree has survived heavy gunfire and aggressive enemy soldiers. But can he handle a girl? See them in Dear John.
Gordie Lachance never had any friends later on like the ones he had when I was twelve. See them in Stand By Me.
The witty Aku would be an ideal dinner guest, if he weren't a demon. See them in Samurai Jack.
Hannah Horvath is kind of a mess, but she owns her messiness in a way few people do. See them in Girls.
A precocious 11-year-old, Satsuki Kusakabe is not quite as grown up as she pretends to be. See them in My Neighbor Totoro.
Hiro is a free-spirit and remarkable genius who loves bot fighting and problem-solving. See them in Big Hero 6.
Susie Salmon has a big heart, even though it's not beating anymore. See them in The Lovely Bones.