Because you like Mr. Gold in Once Upon a Time
It's a race against time to develop his theory of the origins of the Universe before Stephen Hawking's body and mind give out. See them in The Theory of Everything.
A meticulous forensic scientist, Edward Nygma is insanely good at his job. Emphasis on the "insane" part. See them in Gotham.
Working as a captain in the American Expeditionary Forces and a spy for British Intelligence, Steve Trevor wants to end World War I once and for all. See them in DC Extended Universe.
Christian is a romantic who for some reason won't stop singing everything he feels. See them in Moulin Rouge.
Galina Reznikov is the head chef of prison, cooking up meals as well as storms on anyone who dares to cross her; even the guards are terrified of her. See them in Orange Is The New Black.
Xander Harris' life motto: laugh in the face of danger and then hide until it goes away. See them in Buffy the Vampire Slayer.
Petyr Baelish's main assets? A sharp mind, deep pockets, and no scruples. See them in Game of Thrones.
Samwell Tarly is a scholar, not a fighter. But that's not good for an aspiring member of the Night's Watch. See them in Game of Thrones.
Davos Seaworth is steadfast, intelligent, and trustworthy, which are hard traits to find in a place like Westeros. See them in Game of Thrones.
Although she is underestimated, Lagertha never fails to prove her worth as both a warrior and a mother. See them in Vikings.
This bite-sized, power-hungry plankton is determined to uncover the secret recipe for the Krusty Krab burger. See them in SpongeBob SquarePants.