I'm going to weigh in on this.
So first of all, just for the record, there is no way an indication of any sort of -ism on the part of @GirlCalledBlu and @Seraphim73. They have created an alternate history specifically to avoid those kinds of ugliness, so please nobody judge the game based on this current discussion.
Regarding Jiayi's "theme song"... well, yes, YIKES. But as far as I recall, that wasn't there when staff approved that character. I'm fairly sure it was added afterwards.
As for an Imperial Japanese military officer PC, I'm less concerned about her IC views towards her Emperor, but more concerned about what the character represents. Yes, she is a member of the Imperial Japanese Army, which is aggressively attacking and invading other Asian countries, killing and raping their people. As one of the PCs who is from one of those invaded countries, I admit I was struggling to try and figure out how to interact with her. Unless she publicly states that she condemns Japanese expansionism and war crimes, I can only display blanket hostility towards that character, or I can choose to avoid her in all my scenes... neither of which is a good solution. So @Rome 's updated policy comes as great relief to me, knowing that Japanese characters must be opposed to the military expansionism. It'll still take some IC wrangling for the characters to coexist peacefully, but that'll be interesting RP rather than OOC pain.