Because you like Stan Marsh in South Park

Milo Thatch is an enthusiastic researcher without cynicism. See them in Atlantis: The Lost Empire.

Danny Zuko's car is auto-matic. Its system-matic. Its hyyyyydro-matic. Why, its greased lightning! See them in Grease.

Jesse Aarons' frustration can only find outlet in another world. See them in Bridge to Terabithia.

The cutest kitty this side of the galaxy, Nepeta Leijon is mischievous, caring, and obsessed with romance. See them in Homestuck.

Catwoman might be slightly unhinged, but you can't say this feline villainess isn't confident. See them in DC Extended Universe.

A grumpy tourist trap owner, Grunkle Stan has a few deep secrets. See them in Gravity Falls.

Success for Eggsy Unwin means joining Kingsman, and failure could mean death. See them in Kingsman: The Secret Service.

Johannes Betzler is an overwhelmed little boy caught up in deeply confusing times. See them in Jojo Rabbit.

A crabby troll, Karkat Vantas is perpetually angry about his lot in life. See them in Homestuck.

Gilderoy Lockhart's biggest idol is himself. See them in Harry Potter Series.

Jack Skellington is a nightmare-man with a soft heart and smooth voice. See them in The Nightmare Before Christmas.

Sephiroth wants nothing more than to seize the power of the Lifestream in order to become a god. See them in Final Fantasy Series.