zopzop
Lord of the Great Abyss
People let's be real. One the one hand you have :
Galactus' heralds that are immortal (don't age, don't need to eat/breathe/sleep?), they have FTL speeds and zip around from one end of the universe to the other, they have godlike senses (their mind isn't overwhelmed by traveling at incredible speeds looking for world's suitable for their master), they all have insane durability (the weakest of them dove into the heart of a star and easily withstood the heat and pressure there), they have powerful ranged attacks and a host of other powers they conveniently forget to use in a comic setting.
Vs
A middle aged alcoholic in a metal suit.