He can hide his tentacles if he wants o, i think. You didn't specify how exactly he looks, i took that he's a human with tentacles in addition to his limbs, if it's not like that, then how it is? Does he have them instead of hands and feet? Oh, and he doesn't have to be huge all the time, the growth power says you don't have to be enlarged all the time. You sure you want him a really inhuman *monster*?