Jack is of the shapeshifter species, originally shapeshifters are aggressive and bloodthirsty beings, they invade bodies and transform them into monsters.
Entire species disappeared because of the shapeshifters as I am consuming their prey and merging with them.
Most shapeshifters are evil and aggressive, but there are others, very few who are benign and who like to interact with other people.most shapeshifters are evil and aggressive but there are others, very few who are benign and who like to interact with other species.
As for Jack, he has always been curious to interact, like the others, Jack can consume his victim but he generally only enters the body and leaves to imitate him, the rabbit shape that he currently has is due to the fact that he consumed even being of the rabbit species anthropomorphic (a kind of dan) and to differentiate it he wore blue and red colors with green pants because green is his favorite color