Comics with good trans rep? Or like a trans mc? I'd prefer if there's little to no angst

You'll likely have better luck with western comics/webtoons.

This one is not about being trans but there are a couple of trans characters including one of the MC girls in the basketball team. It's a comedy about a coach and his high school girls basketball team surviving through a zombie apocalypse. It's very queer overall. https://www.mangago.zone/read-manga/shootaround/

https://www.mangago.zone/tag/transgender/

Here you go dear enjoy
https://www.mangago.zone/read-manga/hanayome_wa_motodanshi/
https://www.mangago.zone/read-manga/umareru_seibetsu_wo_machigaeta/
https://www.mangago.zone/read-manga/boku_ga_watashi_ni_naru_tame_ni/