I've made this artwork by being heavily inspired by Helluva Boss and Hazbin Hotel, and also Twisted Wonderland, here I'm making some of the Tmnt, MLP, and Sonic characters as Demons.
For Leo, I turned him into a Cecaelia, in this version, Leo and his siblings were separated from when they were first born, so Leo was found and given under the care of the sea witch, Ursula.
Ursula taught Leo the ways of magic and potion brewing, she also made a spell to give Leo the ability to breathe underwater by making him a Cecaelia, he wanders around the deepest parts of the ocean, helping Ursula find ingredients for her potions.
He also taught Leo how to sing since it was a talent that she had when she stole Ariel's voice. Sometimes, Leo wonders what it would be like if he was up on the surface, and was curious about the human world, one day, Ursula gave Leo a mission: to steal King Triton's Crown and Trident, that was hidden in a museum in the human world.
So after Ursula gives him legs, he finds ways on how he could get the trident and the crown, but one day, he bumps into Twilight Sparkle, the adopted daughter of Ariel and Eric.
With Twilight around, it was hard for him to focus on his mission to make his mother proud of him, he becomes afraid that if he fell in love with Twilight, he will fail and disappoint his foster mother.
