[ For better or for worse, Byleth's guess is wrong -- in that Gen has no intention of calling him anything in particular at all. While he does file that name away somewhere at the back of his mind in case it might come in handy later, he shows no sign of it nor does he indicate any interest in reciprocating.

And while he does answer with a deadpan, ] What d'you fucking think?

[ The expression he's wearing -- brow lowered, eyes narrowed in scrutiny, lips pressed together thinly -- makes it clear that's not his main focus at the moment. ]

-- you're one of those people from weird worlds, aren't you. With how you talk. 'Stranger.' [ His voice drips with sarcasm when he imitates Byleth's inflection with that word. ] What kind of fantasy bullshit are you involved in?