Cleon
Legend
As for the dogai, I think I'm convinced by native outsider. Their reversed joints (and sometimes hands) immediately make me think of rakshasas, which happen to be native outsiders.![]()
Yes, I agree on Native Outsider. It fits their description as "spirits" better than Monstrous Humanoid.
Definitely a generous version of alternate form, the SLAs given above with possibly others related to crop failing, and I'd think a low Int.
I'd rather just give them the more limited shape-changing (alter self or change self) suited to their mediocre Hit Dice. Perhaps this is a 'lesser dogai'. We could give them illusion powers (minor image?) and say they use them for the rock/tree/constellation disguises. A 1/day or 1/week diminish plants would be enough to represent their crop blighting ability.
As for their ability scores, since we've already compared them to a Rakshasa how about taking a Rakshasa's ability scores and and knocking 2 or 4 off the mental stats, so:
Rakshasa: Str 12, Dex 14, Con 16, Int 13, Wis 13, Cha 17
Modify by -4 Int, -2 Wis, -2 Cha.
Dogai: Str 12, Dex 14, Con 16, Int 9, Wis 11, Cha 15
If we give it Con 16 and three levels of outsider, its 3d8+9 Hit Dice average 22 hit points, or 3 short of the original's 25. If we want to remedy that shortfall we could easily give it Toughness as a regular or bonus feat or up its Con to 18.