That "Good Emperor" thing was only in the GBA/PSP remakes, and we have no evidence that Brian ever played Dawn of Souls or anything. Plus, the whole thing made no sense.
And, uh, whoever said it was a reference to FFII?
EDIT: On a somewhat related note, recently I remembered an old theory that killing Black Mage would be the greatest act of Good, hence why he never tries to kill himself (as he would go to Heaven). I thought to myself, "That's ridiculous, Lich killed Black Mage and went to Hell." But then I realized Lich wasn't exactly "killed", he was banished to Hell. Thus, Lich may have, in fact, registered as "Good" at the time. Furthermore,
since Sarda killed the Light Warriors multiple times, he should count as, like, Super Good. (I'd say killing Red Mage is about as Good as killing Fighter is Evil, so it's more Good than Evil.)
EDIT2: But then again, he brought them back each time and eventually decided to let them live. That's, like, the worst act imaginable.