This is hilarious. No, seriously. This is so weird and inconsistent, I think it is (unintended) hilarious.
The author clearly has a thing for masks, and the super sentai vibe is definitely out there. It's just that, there's this very weird touch of realism for the silliest of things.. like, magic, masks, and otherworlds? Sure! But Instead of cool mechs or teleportation we have to ride red buses to get from A to B. Also copypaste mob characters.
Btw, isn't MC's level 10k or something? ......What does that even mean?
No seriously! What's the point of reference?! We somehow got that number as a shock value-ish exposition moment, to make us, the reader, go something like: HOLY CRAP! This Hyung is amazing!
Yet he hasn't done anything that even resembles something fitting of that scale? Then again, It might have been a mistranslated dialog.
Fighting wise, at a high level, so far we've seen nothing really.
iirc USA dude was around level 250. So, should we base his "fight" against UK as a reference for how strong they are? Because so far, everyone, minus the Maou, seem weak as hell.
Also, World Domination by The Masked Monarch < - Almost sounds like a single from an old metal band.