If I were to re-create my main character, he would stay as a chaotic-affiliated sorcerer among evil-affiliated creatures under his command. The reason being that if I, personally, were to obtain any type of power for myself (in real-life), I would most likely use it for my own profit, amusement, and thus be irresponsible despite my seemingly good-nature on the surface; I've come to terms with it and embraced that side.
That being said, Prospero Milan is riding what is called a "Kelpie," the Scots name given to a shape-shifting water spirit inhabiting the lochs and pools of Scotland. It has usually been described as appearing as a horse, but is able to adopt human form. The origin of the belief in malevolent water horses has been proposed as originating in human sacrifices once made to appease gods associated with water, but narratives about the kelpie also served a practical purpose in keeping children away from dangerous stretches of water, and warning young women to be wary of handsome strangers. It was said that these evil-spirits would take these disguises to lure their prey into the water to drown them (perhaps to devour their prey as well); either as a horse for children, tempting them to ride on their backs or as handsome men or beautiful women for older audiences.
In any case, I chose the Kelpie to be Prospero's steed instead of the gentler, more beautiful Hippocampus to represent his alignment. It seems to work well within the piece and I'm happy with the choice I've made. Can anyone also see the lamp hanging by Prospero's belt by any chance?

Made by  pranky1