Marvel

Krang is not a Marvel Comics character. He is a prominent antagonist from the Teenage Mutant Ninja Turtles franchise, primarily appearing in the animated series and associated media.

Krang hails from Dimension X and is a warlord, often depicted as a brain-like alien residing in a robotic body. Stripped of his physical form by his own people, he seeks to conquer Earth and regain his former glory.

In most iterations, Krang allies himself with Shredder and the Foot Clan, providing them with advanced technology in exchange for their assistance in his plans. He's known for his scheming nature, booming voice, and constant bickering with Shredder, despite their mutual reliance.

While the Teenage Mutant Ninja Turtles have crossed over with some Marvel properties in limited-run comics, Krang himself remains a core element of the TMNT universe, not Marvel's.