[quote=@ERode]
I wouldn't be too eager to apply Gomi as a defense against internal burning myself. He's heat resistant, not heat conductive as far as I'm aware, so it'd be more of a scenario where someone wears a firefighter's uniform, and then set themselves aflame inside, thinking that the uniform would protect them. Not like the Gomi slime literally fuses with your body, right?

Pretty sure the slime being an exterior coating would actually interfere with Sanyu's ability, which I think is contact based?
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Yes! I'm sure Gomi would be both a tough opponent and a good ally to Sanyu because he is heat resistant. Gomi wouldn't work well infused with Sanyu, but he could protect someone else from her heat.
I do think Sanyu would be capable lf hurting Gomi though, since he is only heat resistant, not immune. But Gomi infusing with Sanyu would probs mean she wouldn't be able to use her quirk on anyone but Gomi directly, making it super inefficient xD