I think a threaded text board might be cool. Back in the 90ies, many western boards used to be threaded, but it went out of style when UBB and its ilk became popular. Might have been due to having having to click on every single post to read it in the popular implementations back then, while the flat boards just showed all of the posts. An indented thread layout like in this thing might be nice: https://www.mwforum.org/forum/forum.pl