Because you like Leonard Hofstadter in The Big Bang Theory
Loyal to his family and associates and distrustful of anyone else, Tony Soprano is a good guy to have on your side. See them in The Sopranos.
She's mostly doom and gloom, but you'd get nowhere without Sadness. See them in Inside Out.
Shaun is used to being lazy. And now, you're asking him to fight for his life? See them in Shaun of the Dead.
V is a violent anarchist with literally nothing left to lose. But, he might have a point. See them in V for Vendetta.
Kara "Starbuck" Thrace will beat you in cards, drink you under the table, then fly circles around you in her fighter plane. See them in Battlestar Galactica.
WALL-E is a quirky little romantic robot cleaning the wasteland known as Earth. See them in WALL-E.
It doesn't matter how noble or brave he is. Jon Snow is a bastard, and people don't let him forget it. See them in Game of Thrones.
Susie Salmon has a big heart, even though it's not beating anymore. See them in The Lovely Bones.
Orphan Bruce Wayne has a tortured soul, but he's trying his best to weed out corruption. See them in DC Extended Universe.
Gou Matsuoka offers to help as manager of a swim team, believing that they're the only ones who can help her brother. See them in Free! Iwatobi Swim Club.