[kianduatha]

The Yomi with Fire resistance have it because they have innate Fire magic, not because they're used to a hot climate...that's why only the Yomi that can Throw Flames have FR. And there are cold-aspected demons too, so I'm not sure that Heat-1 makes much sense. As they are now, because many of their units have Fire resist, you can probably get away with taking Heat-3 without so many repercussions, but it isn't their native heat preference.

Why should Sorcerers get Air magic baseline instead of Death, thematically? I mean, we are talking about "a dark magician who has chosen to serve an Oni King to gain power". Sounds pretty dark/death-y, not air-focused.

You have an excellent point though about Hannya overshadowing Sorcerers. Perhaps a small price decrease(they are very old, after all) or a research bonus of 1 would make them comparatively more attractive, because right now they simply aren't better researchers than Hannya.

As an aside, I made a practice game with Yomi and my first Dai Oni was A2, heh.