>>281928001
>why haven't more super-powered vaguely human sentient creatures traveled up and out of the abyss?
We might find out soon

>>281427583
He might show up again whenever this side story/flashback gets continued (its only been 3 years)

>>281377613
He decided to throw us a bone
There are still lots of mystery characters from the end of vol 13 andwWe're still waiting to see what this is from 3 years ago