Ponosuke Ninokuru, usually referred to simply as Ponosuke, is a supporting character in the manga and anime series Ayakashi Triangle. He is an ayakashi, a supernatural being, with the nature of a pigeon, and he is described as a humanoid pigeon ayakashi who belongs to the Ninokuru clan of exorcist ninja. He is also classed as a hato-tengu, or pigeon tengu, and in his humanoid form he appears dressed in the robes of a yamabushi, a mountain ascetic.

Ponosuke serves as the familiar of Soga Ninokuru, working directly under him and acting as his trusted companion. His background explains his deep devotion: he was once saved by Soga from being devoured by a cat, and that rescue inspired an abiding loyalty. Out of gratitude, he dedicates himself to serving Soga faithfully, and over time he becomes one of Soga's most reliable confidants, fully earning his master's trust.

In personality, Ponosuke is polite and courteous in the way he speaks, with a distinctive habit of ending his sentences with the syllable "po," a verbal quirk tied to his birdlike identity. His motivations are centered on loyalty and service: he wishes to repay Soga for saving his life and to carry out his duties within the clan dependably.

Within the story, Ponosuke has a supporting role rather than a leading one. He accompanies Soga, assists in his activities, and serves as a dependable ally, with most of his appearances connected to Soga's presence in the narrative. As an ayakashi with pigeon and tengu traits, he has abilities related to his supernatural bird nature, and he can appear in birdlike or humanoid forms.

Ponosuke's personal development is less extensively explored than that of the main characters, but it is defined by his relationship with Soga. He remains loyal and dutiful throughout, and the bond between the two deepens as he repeatedly proves himself a faithful and trustworthy partner.