Because you like Helena in Orphan Black
Cher Horowitz may have a problem with hubris, but she looks utterly fabulous while learning a lesson about the dangers of meddling. See them in Clueless.
Optimus Prime is a shapeshifting sentient robot leading a team of robots to stop evil from taking over. See them in Transformers.
Fox Mulder is a devoted believer in aliens, monsters, and that the truth is out there. See them in The X-Files.
For somebody who won't answer questions, the enigmatic C.C. sure asks a lot of them. See them in Code Geass.
The brilliant and well-adjusted Ender Wiggin is being groomed for the next generation of military leaders to fight alien invaders. See them in Ender's Game.
As the unit chief of the FBI's Behavioral Analysis Unit, Aaron Hotchner is dead serious about avenging dead people. See them in Criminal Minds.
Everything is handed to Sarah Cameron on a silver platter. The problem is that she doesn't want any of it. See them in Outer Banks.
Will Byers is just like any other twelve year old, except he's stuck in another dimension. See them in Stranger Things.
Told her son will one day save the world, Sarah Connor dedicates her life to training him to do just that. See them in The Terminator.
Benoit Blanc is Sherlock with Southern charm, and a mysterious benefactor. See them in Knives Out.
An inter-dimensional demon, Bill Cipher dreams of a more chaotic Gravity Falls. See them in Gravity Falls.