The full array of comic book superheroes invites some investigation.
Batman represents those who are otherwise physically normal people who have earned or created greater physical powers to achieve moral goals. Tony Stark (Iron Man), Brett Reed (Green Hornet), and Lamont Cranston (The Shadow) are in that set. Also, they have dual identies. The wider world does not know who the superhero really is.
Superman, Thor, the X-Men and their counterparts the Avengers, Wonder Woman, and others, were born with super powers. Their alternate identities as ordinary people disguise their natural beings.
Thor is an exception to that, being a god with no alternate identity. Thor, in particular, is especially altruistic, having regained his lost godhood only after being willing to sacrifice himself to save others, a obvious play on the Jesus story. Green Arrow is another conscious altruist whose motives surpass the common philosophy of do-gooding.
Can anyone can recommend a hero (except for Mr. A) who is even mildy egoistic?