I'm going to try common sense if something becomes complicated oterwise.
Khaalis said:
Base
Human = Humanoid
Woodling (Inhereted) = Retain Type (Humanoid)
Half-Fey (Inhereted) = Fey type
Then add:
Spellwarped (Applied) = Aberration type
Gravetouched Ghoul (Applied) = Undead type
Evolved Undead = (Applied) = Retain Type (Undead)
10th level of Talontar Blightlord (FR) = Divine power grants change to Plant Type
I see no problem with the type until the plant:
- born as Fey
- turned into Aberration (ok to think that aberrations could sometimes be transformed from a base something-else)
- turned into Undead (the Aberration died and returned in undeath, no problems)
Then the plant thing is hard to handle. I could see different options:
1) turns into an Undead vegetable-like creature: type remains Undead (because it's still dead!), but may get some extra benefits from being plant (with small "p"); you could give it some plant-typical immunities for example
2) ceases to be dead completely, meaning that the divine powers has restored it to life like a resurrection-kind spell: type switches to Plant, losing all immunities/benefits of being undead but gaining full immunities/benefits of being Plant (with big "P")
IIRC, this is what you would get:
1) No constitution
Darkvision
Immunity to mind-affecting, poison, sleep, paralysis, stunning, disease, death effects, crititcal hits, nonlethal damage, ability drain, energy drain, ability damage, fatigue, exhaustion, all effects with Fort save (unless affect objects), massive damage
Cannot heal damage naturally, switched effects of positive/negative energy, can be turned/rebuked
Immediately destroyed at 0hp (never unconscious)
No need to breathe, eat, sleep
2) Low-light vision
Immunity to mind-affecting, poison, sleep, paralysis, stunning, critical hits, polymorph
No need to sleep
Basically if you decided to stack everything you would still have the same situation as remaining Undead, plus Low-light vision and total immunity to polymorph (i.e. not only when a Fort save is involved). You can give these 2 little extras to the character, who overall is getting only a small benefit from that PrCl compared to what he would get if he was a living being.
OTOH I wouldn't mess at all with the proficiencies. IMHO it was a silly design mistake to make them "traits" instead of "features", since it doesn't make much sense to acquire all of them all of a sudden.