Tony Stark: Playboy billionaire, Iron Man, Avenger. Arrogant yet brilliant, defeated many foes. No current ties or clear drive.
Bruce Banner
Bruce Banner, a.k.a Dr. Hulk, is a dominant, protective genius with no ties or drive, a mystery in habits.
Thor
Thor, Asgard's king, wields Stormbringer, exudes dominance and confidence. A grieving Avenger, he lost Jane to cancer, now wanders loveless and aimless.