Gregory Stark (Earth-5430)

"The man's a damn nightmare, Phil. But he's ten times smarter than Tony is and completely amoral...In other words, just the kinda guy I like doing business with."

- - Amanda Waller to Phil Coulson

Gregory "Greg" Stark is the older twin brother of Tony Stark AKA Iron Man, and a financer of both Stark Industries and S.H.I.E.L.D., whose director, Amanda Waller, is a great friend of his. While Greg and Tony doesn't get themselves well along, Greg still loves his brother, to the point he aided him in the Civil War, even though he believed Batman and Captain America to be right.

Personality
"I'm Tony Stark's brother, you idiots. I built myself a nanite force-field and it's twinkling with super-powers. I was never going to risk a mission this important..."

- - Greg Stark to the Justice League

Abilities

 * Expert Businessman: Much like his brother and father, Howard, Greg is a expert businessman, helping Tony mantain Stark Industries while also serving as a financer of the Justice League. He was partially responsible for the successful relations between Stark Industries and Wayne Enterprises.