Dr. Rarity

Dr.Rarity is the main antagonist of Cartoon Network vs Nickelodeon and the responsible behind the tournament.

Appearence
Dr.Rarity is obviously a parody of Dr. Strange from Marvel Comics, his transformations are also a parody of BlackHeart from Ghost Rider and Shuma-Gorath from Dr.Strange, both from Marvel Comics too.

Story
To be added...

Trivia

 * Dr.Strage is a hero but his parody is a villain
 * His battle themes are similar to Two Bowsers (1st and 2nd Phases) and Final Battle (Final Phase), both from Paper Mario: Paper Jam Bros.