New Biome with New Trees + Mobs

A biome where it reflects a more moonlight feel with purple moonlight-like trees and purple fairies that wonder around and possibly a mob that's an additional version for the witch but as the moonlight/twilight witch and especially tiny golems that wonder around around as well by name of "Moonlight Gaurdians". I made this request on behalf of my friend who wanted this to be a thing as she loved the idea of more purple blocks specifically wood for a moonlight feel.