Tendril is an H. P. Lovecraft-influenced character resembling Cthulhu. A slimy hybridization somewhere between a mollusk and a walking mass of seaweed, he can regenerate his vine-like limbs — large enough pieces will even grow into new Tendril monsters — and he is able to alter his size at will. More berserker brawn than brain, intelligence is not this creature's strong suit, he exercises a slurred screeching in his speech, and is clumsy and flailing in his movement, and has less-than astute powers of observation.