Kamehameha Soul!
I don't imagine Toei has enough restraint, so I went ahead and did what we all know what they're gonna do---have Ghost wear a Hawaiian shirt. It'd be red and yellow, like King Kamehameha's colors. The shoulder pads are shaped like the hat Kamehameha is usually shown wearing, but when I finished drawing this I realize they could also perhaps double as being fruit slices. And of course his light-up head becomes a ukulele, which his horn serving as the neck.
Darwin Soul!
The meeting between birds and dinosaurs! It's evolution! The top part of his light-up head is meant to be wings, while the bottom resemble dinosaur fangs. On his hood, there are white triangles which double as bird feathers AND dinosaur fangs with the back of the hood being a T-Rex. Then he has claws for shoulder pads (dinosaur claws, or bird claws, it'd be ambiguous), wings surrounding his chest, and then the jacket is purple with scaled patterns, with the bottom having feathery fringes like a bird.
Shakespeare Soul!
The face is supposed to be a hand holding up a skull---as in Alas, Poor Yorick, then he's got the classic Victorian frill, a black hood to resemble Shakespeare's hair, book bindings, open-book shoulder pads, and "R" "J" letterman-style jacket. Kind of ended looking like a pirate though...