First skill - Transform(switch form). Simple:transform between humanoid and lion forms. Human form just like magician. Lion form then unable to grasp bunnies, but damaging them by hitting with claws. In lion form Strongman will accelerate speed while run forward(slow turning to sides proportional speed reached, stuns for second or two when meet wall on high speed.) In any case transform to human form should be slow(2-3 seconds) to give time for buns break distance and avoid get key taken.
Second skill - Leap. In humanoid form it's vertical(replacement for booth travel in main halls in limits of one room, if we coming with terms that booths are magi-only trait. Without it Strongman will be locking self on lower floors.), jump up on one floor approximately(like in performance hall from first second). Coming to think - have sence make jumping pads to travel up and down along main rooms similar to booth travel. Then in human form as skill he can chasing buns straight, hopping over obsticales. In lion form - horizontal(when meet wall allow to avoid stun transforming it into turn.)
Third skill - Roar. Apply stress on buns, depending on how close they were to Strongman. Highlight auras of furthest buns for short time.
Fourth skill - Tear/Dash. In human form damage bun in grasp without casing them panic. Alternative - challenge bunny with three skillchecks. Fail skillcheck - get damage. Then Strogman stuns for 10 seconds. In lion form dash forward reaching top speed.
Gear skill alike "listening" - Ambush/Tracking. In human form crouch, suppressing movement sounds and turning off eye projectors(move slower, obviously), can change form faster. In lion form loose ability to accelerate but still can move, purring like engine. While so Strongman see auras of buns not playing dead and auras of buns play dead nearby.