Fubuki, whose full name is Fubuki Kai, is a primary character in the anime La Blue Girl Returns. She is introduced as a self-made ninja with a driven and competitive personality. Her primary motivation is to challenge the protagonist, Miko Mido, in order to prove her own superiority and establish herself as the rightful head of the Miroku ninja clan. Fubuki believes she is more talented than Miko and is determined to demonstrate this in a direct confrontation.

In the story, Fubuki seeks out Miko specifically for a duel. The terms of this conflict are unique to the world they inhabit, as it takes the form of a sexual duel, a common method of combat and resolution within the series' lore. Fubuki is ultimately defeated by Miko in this encounter. However, rather than remaining an enemy, her defeat leads to a significant change. She is subsequently adopted by the Shikima, a race of demonic beings central to the series' mythology, and becomes a friend and ally to Miko.

As part of her adoption by the Shikima, Fubuki undergoes a profound physical and spiritual transformation; she is turned into a Shikima herself. This transformation is something she desired, as she sought the power necessary to equal Miko Mido. Her new form grants her this enhanced power, and she becomes fond of it. Fubuki’s relationship with Miko evolves into a complex friendship. While she is an ally, her competitive nature does not completely vanish, and she can irritate Miko by occasionally proving to be better than her in certain aspects. Fubuki’s role within the narrative is therefore that of a rival turned companion, whose personal quest for power and recognition leads to her becoming a member of the Shikima realm. Her notable abilities are rooted in her skills as a ninja, which are later augmented by the powers she gains upon becoming a Shikima. There is no information available regarding her specific techniques or further development beyond her transformation and established friendship with Miko.