The
Blue Sky, White Sun, and a Wholly Red Earth flag might be a bit more appropriate for that republic flag (if you don't want the 5 races flag). The Blue Sky, White Sun flag was only used during the revolution (and afterwards as the flag of the Kuomintang Party in particular, not the nation as a whole).
The Japanese also used the White Sun in some of their puppet state flags as well, iirc (not very creative, I guess).
On another note:
- No "California Republic" for the bear flag?
- Any particular reason why you changed the character on Yunnan's flag from black to yellow? It looks rather washed out, and black (especially for a character) doesn't change the overall color scheme that much if you're trying to get consistency there (and for a warlord clique, I suspect the flags in vanilla are already far too consistent for what the flags would actually look like).
Are you not using default flags (so no distinction between Democracies and Republics)? It could allow you to fit in more flags and distinguish between Presidential Dictatorship style "republics" and democracies.