Momotaro is a supporting character in the anime Hōzuki no Reitetsu, adapted from the manga by Natsumi Eguchi. He is a spirit who, in life, was a famous samurai and a classic folk hero from Japanese legend, said to have been born from a giant peach. In the series, he retains his samurai identity and is depicted as a pretentious, old-fashioned, and prideful figure who is very conscious of his past achievements. He can become easily angered when insulted and is initially introduced as an opportunist and a bragger. Despite this, Momotaro shows a clear capacity for respect and gratitude, particularly toward Hōzuki, whom he addresses as Hōzuki-sama and treats with deference. He often refers back to occasions when Hōzuki helped him, indicating a sense of indebtedness.

Momotaro's motivations revolve around maintaining his pride and his role in the afterlife. He works in Heaven as the assistant of Hakutaku, a Chinese medicine expert and Hōzuki’s main rival. In this position, he grows magical peaches and helps run a traditional Chinese medicine shop. His role in the story is primarily comedic; he appears in various episodes as part of the underworld’s bureaucracy, often clashing with or providing contrast to Hōzuki’s cold efficiency. He also serves as a link to Japanese folklore, with his presence highlighting the series’ frequent mythological references.

Key relationships include his three animal companions: Shiro the dog, Kakisuke the monkey, and Rurio the pheasant. These three, who originally aided him in his legendary quest, now work as torturers in the animal cruelty section of hell, a job that contrasts with their former heroic roles. Momotaro’s relationship with Hakutaku is that of an employee who assists his master’s endeavors, while his interactions with Hōzuki are marked by a mix of wariness and respect. Over the course of the series, Momotaro’s development is subtle but noticeable: he shifts from an outwardly boastful samurai to a more cooperative and occasionally humble figure, though his core pride remains intact.

Regarding notable abilities, Momotaro is a skilled samurai, having been a famous warrior in his mortal life. In his afterlife role, he possesses knowledge of traditional Chinese medicine and the ability to cultivate magical peaches. He also maintains his characteristic attire from his human days, which consists of traditional samurai clothing. No other supernatural powers are explicitly demonstrated in the series.