>>12127380No. They are spirits of nature. Not all fairies are spirits of nature and not all spirits of nature are fairies.
Nymphs? Nymphs included not only wood spirits, but also spirits of the streams and breezes.
A nymph is a stage in the development of an insect. Some insects can fly. Some cannot.
The ribbons may or may not be a tennin reference, depending of who you ask. The bows may or may not reference butterflies, depending on who you ask. The colour scheme may or may not be that of a normal type, depending on who you ask.
Stereotypically fairies are depicted as tiny, human-like beings with insect wings. Some say stories about fairies were based off of fireflies.
So far, I've seen far more evidence for Sylveon being an existing type than a new one.