The kangaroo figurine had its power over the male in the elevator, imposing its influence of adaption in the best way it could. Those human feet had to go. Much larger and three toed versions would have to replace them.

A proper roo shaped head with large cupped fuzzy ears and a long slender snout to help catch the air as they leap through the air next.

Thicker legs to support those large feet, and of course you can't be a proper kangaroo without a pouch! But with the pouch comes a gender change, which has secondary aspects makign themselves known to our rapidly becoming former human. Oh dear, oh my...