Enkidu (Fate)

Enkidu, classified as False Lancer, is a character who originally appeared in the spin-off light novel Fate/strange fake authored by Ryohgo Narita and illustrated by Morii Shizuki. However, this installment has no anime adaptations to date. The character made his animated debut in the 2019 TV series Fate/Grand Order: Absolute Demonic Front - Babylonia, an adaptation of the mobile game's "Babylon" chapter.

Enkidu is based on the character from Ancient Mesopotamian tale Epic of Gilgamesh, serving as the eponymous character's closest friend. In the Fate series, the character is depicted as a green-haired, green-eyed androgynous human wearing a long white robe, and is voiced by a Japanese actress known for voicing multiple male characters. Because of this, Enkidu's gender identity is unknown and must be referred to using gender-neutral pronouns.

Identity Conflict
In F/GO Babylon, Enkidu is depicted with purple eyes instead of the original green, and displays a different personality that is quickly noticed by several characters, especially Gilgamesh. It is later revealed in the story that this character isn't actually Enkidu, but another character named Kingu.

Kingu, the son and husband of the goddess Tiamat, is actually a soul who was inserted into the green-haired Servant's body, thereby gaining its appearance, powers, and abilities. Unlike the genderless Enkidu, Kingu is called by other characters using male pronouns after his true identity was revealed, and has actually called himself the "son of Tiamat" near the end of the chapter.

Kingu acts as one of the chapter's main antagonists alongside Tiamat, and is named after a Babylonian mythological character, but unlike Enkidu he has no similarities to his namesake whatsoever.