Evilcoric is a xenogender with three subsets. It was coined by u/BowNonB on Reddit. The main subset is a gender which embraces the 'evilness' of one's gender, for example how non-binary is sometimes referred to as 'satanic'. The second is a gender that feels/is related to the pure androgynousness of a feral werewolf, also known as evil/werewolfcoric; and the third is a gender which feels/is related to hot-yet-coolness of vampires that is present in all genders, also known as evil/vampirecoric.
Flags
The flags don't have any specific meanings. The evilcoric flag was made to look Hallowe'en-esque and the other two were made to look somewhat like the main flag and also like the subsets they're related to. They were all made by u/BowNonB.