Kukki is actually one of the taru-triplets involved in the CoP storyline. Your first encounter with them would be right after beating the three basic Promivia (Dem Holla Mea)
In CoP mission 7-5, you face Tenzen. Behind you are the three mischievous tarutaru, this being one of them. They check impossible to guage. You cannot harm them at all. They heal/buff tenzen, they hurt/enfeeb you.
it really does....i so badly want to just chainspell Blizz 3 on these ******* or have a samurai buddy turn em into hamburger.... little bastards remind me of me....(yes i have tried to heal/buff an NM when gilsellers were fighting it.... all i got was "Cannot Attack. Target is already claimed." ; ;)