Qi Peijia
I'm starting to suspect that this is less likely a pocket dimension and more like time travel or something. Even if they moved to a distant part of the unexplored universe of the primary dimension, they would still have access to their dimensional abilities. Maybe Han Xiao and Kasuyi travelled to a parallel universe or something. Whatever the case may be, it seems that this place has quite a few Grade SS beings.
Looks like they aren't the first "outsiders" to this universe, and might possibly make a new ally. It also looks to be a mechanic which Han may be able to either learn from or get some swag/missions from. Or a new nemesis to beat up on. Hopefully the prior not the latter! Looks to get interesting very quickly!