Comment by numpad0

Yup, 2ch.net/5ch.net/5ch.io uses the MS P Gothic and there were app features and fonts like Mona Font to emulate that. They were not imageboards, though.

I just thought that MS Gothic(non-P) should be kind of widely supported, have all the symbols you need, while also being a monospace, unlike most monospace fonts that only support ASCII symbols.