Okay, well... [Leaning against a nearby tree, he starts to gesture with his hands a bit.] It's not shaped like you are physically, y'know? They're more round, and generally they have like a tail-

[His hands make out a vaguely round shape, drawing a squigly line through the air up top.]

But they can be really unique too, with their own characteristics that're your own and no one else's. Some forms of souls are even really rare.