Ah, it just occurred to me even though I've already posted: Do I need to make some kind of NPC profile, if I'm just throwing out a "generic" villain or whatever? Like, they're not a character I intend to play as, but if GM or anybody else wanted to use them again they could. The bank robber Zetta Man's currently chasing basically has the powers of the Diamondhead alien from Ben 10, just that they form the crystals as a shell over their body rather than being made entirely of it.