Responses
What do you mean by politics? If you're fine with war manga, Groundless has begun expanding on the political ideologies of it's world, but it's main focus is as a military manga:
https://www.mangago.me/read-manga/groundless_sekigan_no_sogekihei/
The recent arc of Fools Night also has some political elements in play but I'm not really sure how deep it'll go:
https://www.mangago.me/read-manga/fool_s_night/
Thank you for the reccs but they don't really look my style
Manga with complex characters and (fictional) politics, preferably seinen
Less than 12 volumes