Before anyone asks, that's Little Nase, not big--er, regular Nanase.
Technically speaking, her hair never really did turn black. Sort of. I mean, it WAS black (with blue highlights), but on an actual genetic--THAR BE SERIOUS MAGIC AFOOT, OKAY?!
Frankly, it's a fair question. If vampires enjoy creature comforts and such, then it's not entirely unreasonable that they would be at the mall for super mundane reasons. Plus, depending on the type of vampire, they might still want / need normal food on top of all the vampirism.
Of course his name is Zeus. It's something I wanted to foreshadow more, but I couldn't think of any way to do a call back to Jerry mentioning immortal names and how some of them would choose names like that without 100% giving it away.
Granted, people totally guessed it based on the earlier Jerry comics, but there's that information being out there for people to recall, and then there's "hey, remember that exact thing? I swear I'm not bringing it up for any reason that's super obvious."
I was also hoping to give a bigger panel to that reveal, but it was either make that panel bigger, or the last panel smaller, and I made my choice.