[quote=@Roosan]
[@Vahir]
I understood that they were physical beings but I thought part of their reincarnation process was taking over someone else's body? That was what I meant by 'preferred form', picking someone that fits with what he normally looks like.
[/quote]

Oh, yes, you're quite correct in that regard. But by taking over a mortal's body, it's morphed into their own shape. If a dragon Child reincarnated, for example, the unfortunate mortal would slowly sprout wings and grow scales.

Picking a physically similar host would accelerate things greatly though.