The Eveelutiogender system is a gender system people who identify in the non-binary or kingender spectrums. People who use this gender system are connected with the eeveelution pokemon. They may relate to them, or just want to incorperate them into their gender.
Identities
Eeveian -a gender that feels small and cute, very simplistic and pure, relating to the pokemon eevee.
Umbreian -a gender that feels dark and mysterious, capable and a bit agressive, relating to the pokemon umbreon.
Flareian -a gender that feels passionate and angry, loud and boisterous like a flame, that relates to the pokemon flareon.
Leafian -a gender that feels quiet, sweet and kind. very involved with nature, like clear streams and birds singing, relating to the pokemon leafeon.
Sylvian -a gender that feels flowy and mysterious, strange and not quite of this world, very friendly and mischievous, relating to the pokemon sylveon.
Vaporian -a gender that feels playful and fluid, often changing form from solid to liquid, relating to the pokemon vaporeon.
Espeian -a gender that feels kind and sweet in a parental way, wise and mysterious, relating to the pokemon espeon.
Glacian -a gender that feels solid and sharp, like an icicle, very set and determined, relating to the pokemon glaceon.
Joltian -a gender that feels as though it builds up and strengthens overtime, very defensive and sharp but can shift with mood, relating to the pokemon jolteon.
Demigenders
Eevion -a partial connection to Eevian
Umbrion -a partial connection to umbreian
Flarion -a partial connection to flareian
Leafion -a partial connection to leafian
Sylvion -a partial connection to sylvian
Vaporion -a partial connection to vaporian
Espion -a partial connection to espeian
Glacion -a partial connection to glacian
Joltion -a partial connection to joltian
Combinations
Umbeevian -a mix of umrebian and eeveian
Flareevian -a mix of flareian and eeveian
Leaflylvian -a mix of eeveian and leafian
Espeporian -fluid and unaligned
For other combination identities, One would take the first half of the original word, then take the second half of the second word, and add ‘ian’ at the end.
The definitions were helped by plutos orbit#6092 on discord!