Ephemer

Ephemera is a Keyblade wielder who appears in Kingdom Hearts χ. He seeks to discover the truth behind the gathering of Lux and the structure of the World.

Kingdom Hearts χ
Ephemera is a member of a different Union than the Player. When he first meets them, he reveals that the Lux the Player is tasked with collecting from the various worlds truly belongs to Daybreak Town. He also claims the worlds the Player has visited up to this point are actually illusions created by the Book of Prophecies each Foreteller possesses. After the Player tells Ephemera about a strange dream they had about the Foretellers and a mysterious figure, the Keyblade wielder decides to team up with them and investigate this matter.

Together, Ephemera and the Player dispatch several Heartless as they make their way towards the Foretellers' headquarters. The two ultimately decide to abandon their investigation, and soon afterwards, Ephemera mysteriously disappears. Some time later, the Player has a dream about Ephemera in which the Keyblade wielder asks Foreteller Ava to divulge the secrets of the Book of Prophecies. Ava refuses.

The next day, within another of the Player's dreams, Ephemera reunites with them. The two briefly resume their earlier investigation. When the Player awakens, they learn in a conversation with Foreteller Ava that Ephemera may be in another dimension and is possibly using dreams to communicate as he closes in on a hidden truth.

When the Player meets an enigmatic Keyblade wielder named Skuld, she reveals that Ephemera is from her Union and seems to have changed. Skuld claims Ephemera is also appearing to her in her dreams; in one, she reveals, he tells her the World is nearing its end.

Design
Ephemera has silver hair and blue eyes. He wears a white shirt, black vest, dark grey pants, and black boots. A red scarf is wrapped around Ephemera's neck.

"Ephemera" refers to things that are short lived or transitory, perhaps referring to how Ephemera disappeared shortly after the Player met him.

Abilities
Ephemera wields the third upgrade of the Starlight Keyblade, and is accompanied by his own Chirithy.