[@Zardoric]The most powerful character concept suggested so far is a Mega-Juicer, and I'm willing to accept things around that because a Juicer doesn't have spells or psionic powers, same goes for a Mega Damage Full Conversion 'borg. I'd prefer to have Mega Damage beings either have innate natural powers as their abilities(a la a dragon hatching R.C.C), or be forced to wield technology-based weapons. A creature such as a Nightbane with their innate abilites, coupled with a Ley Line Walker's spellcasting(Them also being the most versatile of the casting classes) is just too much.

Basically, the most powerful anyone not using technology as their weapon should be, is a low-Mega Damage being that uses innate powers opposed to a sort-of class.