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Without body, it can exist as what? In what form? As a human or spirit?

Form is the concept of our material universe, where every body has a form consisting of atoms (born of stars). I think that in other dimensions there are no such forms of matter. It's probably some kind of energy.

it probably some kind of energy.

"probably" Means that you are not sure but still need more research. I will implore you to do more. But via a right sources.

"Kind of energy", since humans can achieve an act. Its a kind of energy and a soul likewise other lower animals like dogs etc. They are souls.