Fat Tiger grew constantly as the days passed and became more ferocious with each hunt.
However, Fat Tiger's growing curiosity from the 'curious' attribute Roy set when designing him made Roy a little helpless. After being able to hunt alone, Fat Tiger stopped killing demons and monsters immediately, and he would tease them over and over.
He would first let the prey escape and then chase it from behind. He would knock down the opponent with a swoop and then let the prey go again. He would simply use his claws to hold the opponent down if he saw some strangely-shaped demons and then use the six eyes of his three heads to observe the prey. He would only kill the prey when he got bored of it.