Because you like Lindsay Weir in Freaks and Geeks

When the going gets tough, Rick Grimes gets tougher. It's a very useful trait when the world goes to hell. See them in The Walking Dead.

With an A.I. as loyal and witty as Cortana, who needs humans? See them in Halo.

A fight every now and then makes Dante's life a little more interesting. See them in Devil May Cry.

Sylar's victims are found all over the country, many with their brains removed. See them in Heroes.

Simba just can't wait to be king, but he's got a lot of growing up to do first. See them in The Lion King.

Daxter is half otter, half weasel, all snark. See them in Jak and Daxter.

Phil Coulson is a deadly field agent with the demeanor of a friendly dad. See them in Marvel Cinematic Universe.

Eragon is one part brave but three parts fool. See them in Eragon.

Leonidas is not the kind of king who merely gives orders; rather, he's out on the battlefield fighting alongside his men. See them in 300.

Stuck somewhere between life and death, Talion is motivated by one thing only: vengeance. See them in Middle-earth: Shadow of Mordor.

After training a herd of raptor dinosaurs, everything else is a breeze for Owen Grady. See them in Jurassic World.

A master manipulator, Frank Underwood has a tight grip on Washington DC. Plus who doesn't like having a leader who frequently tosses off Shakespearean asides? See them in House of Cards.