Yeah, this is pretty cute.
I just wish the token belligerent-noble would be more cunning, and less direct.
If the whole point of nobility, is their social authority, they should emphasize their power via systemic oppression (using the teachers to discriminate against the MC, have secret clubs where they organize, and ensure they stay on top, etc) -- rather than, ya'know, solve things oonga-boonga style, by directly attacking.