Because you like Vincent Vega in Pulp Fiction
Wanderer is a Soul, a parasite sent into a host to take over their body, extracting information from them and colonizing their species. See them in The Host.
Jason Bourne is suffering amnesia, but considering what he's done as a CIA assassin, maybe that's for the best. See them in The Bourne Identity.
The Ice King is lonely and looking for a princess to sweep him off his feet. See them in Adventure Time.
Cinderella will sacrifice herself to keep her family's memory alive. See them in Cinderella (Live Action).
Nancy Wheeler is popular but independent, sheltered but gutsy. See them in Stranger Things.
David Rose likes his rose chilled, his linens pressed, and his family quiet. See them in Schitt's Creek.
If anyone can stay optimistic and friendly under harsh alien rule, it's Alyx Vance. See them in Half-Life 2.
Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.
A self-proclaimed diva, Mercedes Jones is on the hunt for a stage worthy of her talents. See them in Glee.
Although Theon Greyjoy is treated well, he's still essentially a hostage. And that isn't so easy for him to forgive. See them in Game of Thrones.