5. Steel
We're resisting the urge to give Shaq more money here, which is hard to do. Steel popped up when Superman died back in the day, because DC never resists any urges when money is involved. But, inexplicably, Steel stuck around even after his return. And he was even recruited into the JLA by... Batman? Really? Basically, Steel is a dude in a (steel) suit with a hammer. Instant comic book. But Steel retired in the comics eventually. Let's keep it that way.