Because you like K-2SO in Rogue One

Bobby Singer is a redneck ghost hunter, but all he wants to do is retire to the junk yards of South Dakota. See them in Supernatural.

Emma Woodhouse knows what's best for everyone else. Just don't try to tell her what to do. See them in Emma.

Optimus Prime is a shapeshifting sentient robot leading a team of robots to stop evil from taking over. See them in Transformers.

Madman, murderer, or musician? No one knows the Phantom behind the mask. See them in The Phantom of the Opera.

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.

A bloodsucker, Carlisle Cullen is actually more likely to give you a blood infusion. See them in Twilight.

CIA operative Carrie Mathison is on a self-assigned mission to follow a lead, whether it be the truth or just her delusions playing tricks. See them in Homeland.

Leone Montana is a fearless hitman with a surprisingly sensitive side. See them in Leon: The Professional.

Give in to the dark side with vampire Lestat; it's more fun. See them in Interview with the Vampire: The Vampire Chronicles.

As the White House Press Secretary, C. J. Cregg is a master of verbal karate and the best damn basketball player in Ohio Valley history. See them in The West Wing.

Simon Spier has long known that he's gay, but he doesn't know how to open up about that – even to his closest friends See them in Love, Simon.

NiGHTS is a powerful but childlike spirit who hates being told what to do. See them in NiGHTS into Dreams.