Tavi and her brother hade two sides, Feral, which only comes out during extremely high stress situations (like being left with their greatest fears, a extreme fight, etc) and there normal side which is their normal selves, in their feral states, they have more of there animal like sides then human like, they will be like dogs or animals, communicating in growls, hissing, body movements, clicks, etc, they were Big Mama’s guard creatures that would later be rescued by the turtle brothers, and tavi and her brother would both fall in love with one of the brothers later