Meika Hima and Mikoto are dual Vocaloid characters distributed by Gynoid Co., Ltd. They were released for the VOCALOID5 engine in March 2019. They were illustrated by △○□×, aka miwasiba.
Officially, they have no gender and are stated to not be human or people. Their concepts are based on the spirit of plum flowers. Both have horns and wear white double-breasted, sleeveless shirts with red skirts and red/black bridal legwear. Hime has pink hair and blue eyes while Mikoto is reversed with blue hair and pink eyes.
Official art: post #3630006
Gynoid Talk design: post #3789217
Character sheet: post #3630020