You forgot Judge Dredd, who is Dirty Harry on steroids and with a much bigger gun. Also Jean Grey/Phoenix, who is the superhero equivalent of Ginny Weasley -a spoiled, self-centred redhead with an uncontrollable temper and a habit of stringing along as many men as she can manage while being violently jealous about the one she actually wants!

Also if you reckon the Boy Scout from Krypton is the most powerful being in the multiverse, well. There's a certain Devourer of Worlds, a particular TimeLord, an entire race of homicidal pepperpots, a snarky guy with a single-letter name and several chapters of Adeptus Astartes who might very successfully dispute that!