Alexander's Hetaroi
Deity
I mean it's kind of understandable, at least when you compare him to the other leader of Korea, Seondeok, which really does give the question of why make him a potential leader?It's a videogame, dude. And your criticism is very subjective. I think all 3 leaders in this pack are done well and pretty interesting, Sejong included.
Religion would have even made him more distinct and would work since his agenda is Neo-Confucianism.