Aura

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Indeed, Aura's body and most of the Supreme Gods, if not all of them, had bodies like these. Bodies that couldn't be properly said to be human anymore, nor even be what they used to be.

They could shape themselves in humanoid forms at will, of course, but their true bodies could be said to simply be enormous masses of divinity and energy condensed together.

Kireina and Rimuru had already transitioned to this stage too, but because they always keep their humanoid forms, they really didn't realized this.

Therefore, it could be said that Aura himself, like most high-level beings, is a genderless mas of energy… but of course, gender identity is a thing, Flora still identifies herself as a woman and a mother, and Aura as a man, despite wanting to leave behind his human male body and become a mass of nebulas and stars.