Sukuna-Hikona, or in full, Sukuna-Hikona No Kami, is the Japanese dwarf deity of healing and sake brewing and is associated with hot springs. He assisted Okuninushi in building the world and formulating protections against disease and wild animals in myths from the Izumo region.
He first arrived in Izumo in a small boat of bark and clad in goose skins. Later, he was picked up by Okuninushi, Sukuna-Hikona promptly bit him on the cheek. The two, nevertheless, became fast friends.
Sukuna-Hikona is one of the Kunitsu who were convinced to ally themselves with the Hebrew God to confront the Amatsukami, only to be betrayed and imprisoned inside a shrine in the Abyss and requires to be escorted out. He holds a fragment of Masakado's corpse, in his case, the Left Leg.
Shin Megami Tensei IMAGINE
Sukuna-Hikona, despite having held a placeholder role in the game's files for years, has yet to be introduced as a player demon. He does appear as an non-playable character central to the Chain of Curse storyline, where he aids the player in lifting Omoikane's curse and confronting a crazed Take-Mikazuchi in Shibuya's metro. Sukuna-Hikona is a blunt character that doesn't hesitate to insult the player if they come unprepared-- such as when the player refuses him Magnetite in some parts of the storyline.
Devil Summoner: Raidou Kuzunoha vs. The Soulless Army
Sukuna-Hikona plays an important role in the events of Devil Summoner: Raidou Kuzunoha vs. The Soulless Army. In Raidou Kuzunoha the XIV's confrontation with General Munakata, the General is ultimately revealed to be manipulated by Sukuna-Hikona within his body. Crawling out General Munekata's body through his mouth, Sukuna-Hikona engages Raidou to a battle.
Furious with "the servants of the Amatsu" for driving back his own people, Sukuna-Hikona hates all humans in the Capital, and agreed to use the mystery demon possessing Kaya Daidouji's plan to destroy it with the Soulless God Oumagatsu, a massive war machine, and the titular Soulless Army, a group of undead soldiers retrofitted with special armor and techniques.
Despite Sukuna-Hikona's miniature size, he is a powerful foe, capable of using a special skill that seals Raidou's movement for a time being. Should the seal hit Raidou's demon allies, they are forcefully ejected back to the Devil Summoner tube, forbidding Raidou to re-summon them until the end of the battle. It is revealed in Devil Summoner 2: Raidou Kuzunoha vs. King Abaddon that he was possessed by the rage of the Kunitsu, turning him into the being seen ingame.
Persona 4
Sukuna-Hikona appears as Naoto Shirogane's initial Persona. Even though Sukuna-Hikona is a deity of Medicine it is unable to learn healing spells. However, the Shadow it manifested from had wanted to perform a "body-altering operation" of sorts. Sukuna-Hikona's design is reminiscent of the Kamen Rider series, having a bug-like (particularly a butterfly, similar to Metis' Persona, Psyche) superhero motif. When Naoto's Social Link is maxed, Sukuna-Hikona evolves into Yamato-Takeru.
Persona 4 Arena
Sukuna-Hikona returns as Naoto's Persona. It utilizes Hama and Mudo skills which can either inflict Break or outright KO the enemy, and is one of only three Personas capable of using Megido skills (albeit as a hair-trigger type bomb), the others being Pallas Athena and Thanatos.
Sukuna-Hikona is also one of the Personas possessing a skill it cannot learn in the original games, with it being able to learn Double Fangs (and is also shown as a non-Persona attack).
In Ultimax, the latest skill it receives is Blight (Venom Zapper in Japanese), a skill it can learn naturally in Persona 4.
