Momose Sunohara, professionally known as Momo, brings an energetic and playful presence to the stage as one half of the idol duo Re:vale, embodying the "boke" (comedic foil) in their "married couple" dynamic. Off-stage, he reveals an observant and caring nature, frequently prioritizing others' well-being, especially his partner Yuki and younger idols. A sharp intellect underlies his lighthearted image, allowing him maturely navigate the entertainment industry's complexities.

His past includes a period of deep disillusionment, marked by resentment and fear of the future when his dreams seemed unattainable. This changed dramatically upon hearing a song that struck him like an "electric shock," revitalizing his spirit and washing away his sadness, ultimately motivating his idol career.

Momo maintains significant relationships. He affectionately calls Yuki "Darling" or "Yuki-san," while Yuki uses "Honey" or "Momo-kun," reflecting their profound bond. Momo acts protectively towards Yuki and supports junior idols like Mitsuki Izumi, sharing comedy show outings and creating nail art together. He nicknames Tsumugi Takanashi "Manekko-chan," blending "manager" and "kid" to acknowledge her role and age.

Key personality traits include his frequent use of kaomoji in messages, being a morning person, and a broad musical taste with a recent interest in Japanese emo rock. A skilled high school soccer player, an injury before a national tournament ended his athletic aspirations. He values shared joy in relationships, seeking partners he can laugh freely with, and prefers outdoor dates while prioritizing his partner's preferences.

Illustrative moments show his character: dressing as Santa for Yuki's Christmas Eve birthday, playfully tying Yuki's hair with a peach-themed hair tie while Yuki was drunk, adopting mutual "grandpa" nicknames with Yuki near his own birthday, and recalling buying Halloween snacks for his older sister's friends during his youth.

His development highlights resilience and strategic thinking. Confronting figures like Ryou Tsukumo, he displays a jaded, sharp-tongued side often minimized in the anime, such as deceiving Ryou into believing Re:vale had countermeasures against blackmail. A critical hostage scenario underscores his protective instincts and formidable physical strength. While the anime depicts Momo as the hostage, the original game shows Yuki threatened, followed by Momo's intense concern for Yuki's distress after the ordeal.