Chris kinda covered it all, but just so there's an "official" response... :)
Location is left deliberately vague:
1. Uniform is for college, not school, which is privately run and therefore up to the owner of the college, so could be anywhere.
2. Language is English because that's the most widely-spoken language and thus the best for an initial game release, but other languages will be included once the game enters beta. So still not a "tell".
3. Who says this is even the Earth we know? The Nexus is a thing, after all, and at no point have I said "Hey, player! This is the Earth you're living on, too!"
In summary: DUN DUN DUUUUUUUN!
Age of MC is left up to the player. For legal reasons he's 18 or over, but if you want to imagine him in your head as a different age, I can't stop you.
Lomeg will make a return in Act Three, but you need access to Lyx plus a powerful battery first. MC wasn't really bothered about it in Act Two (frankly, it would have been a problem then if he'd had a large cardboard-covered robot following him around) but now? He's definitely into the idea of a WarBot, yes. As is Lyx, worryingly...