Alicornutopia

But until they do, there’s no interesting interaction with the Speech? Or if a fairy goes to Syntropy will they be able to understand tress?

Fairies cannot understand trees in the way that a deaf fairy cannot understand spoken French. I don't think there's any interesting interaction.

Huh, interesting. Correspondence-as-magic-code makes a weird kind of sense, really. (Though if relevant, it does have native speakers - they're mostly stars and various forms of hypersapient alien, but they're out there.)

Would a one-of-a-kind who can breed with any kind of fairy be possible? What if it was male? What if exclusively with other breeders? If it's possible, would there be any restrictions on the offspring's kind? As in, would it be possible for those to also be new kinds as opposed to either parent's kind?

Separately, is harmonics-manipulation a possible kind power?

Breeding is disconnected from sex, so being male wouldn’t be a disqualifier.

Yeah, "parents" is a highly questionable concept among fairies in the first place.

I don't like breed-with-anybody as a kind magic. Gentle limited harmonic effects could be.

How about a one-of-a-kind ability to find other one-of-a-kinds? Or maybe just find abilities? Like some kinda tracker power?

That seems maybe okay.