Ajax used to be ruthless, unfair, cruel, grumpy, obnoxious... some would describe him as downright evil.
He had little empathy for others accompanied by a vicious aura.
At the time, nobody really understood why he was so mean spirited - just ruling it down to it just being how he had developed.

Years later, his angst and demeanor have relaxed into something people never expected of Ajax, though his most common mood is nonchalant or disinterested, he is more tolerant of company and is even commonly seen as being happy or kind-spirited. The most of his mean behavior somehow in the past now.

Ajax is a mutated Thylacine. He stands at 2'3" in height, 3" taller than the average male Thylacine at point of shoulder. With a mutation in his bloodline, he has grown longer and thicker hair along his neck and back, tail and legs. He has however, kept the thylacine's overall build, and 5 toes on the front feet.
He is no stranger to lifes cruel games.