Ibuki Tonami is a central character in the anime Botan Kamiina Fully Blossoms When Drunk. She is a third-year university student who serves as the dormitory president where the protagonist, Botan Kamiina, resides. Originally from Toyama Prefecture, Ibuki acts as a senior figure and supervisor for the other students living in the dormitory. She is characterized by a mature and responsible demeanor that is typical of her leadership role.

In terms of personality, Ibuki possesses a genuine and deep love for alcohol, accompanied by extensive knowledge about different types of drinks. Despite her passion, she is notably self-conscious and reserved, harboring a strong preference for drinking alone. This solitary habit stems from a specific physical trait: when she consumes alcohol, she develops a persistent case of the hiccups. Past experiences where this behavior was perceived as rude have led her to feel embarrassed about drinking in public, motivating her to seek out quiet spots where she can enjoy her highball or other beverages without an audience.

As the story begins, Ibuki appears to be content with her solo drinking ritual. However, her motivations shift following her encounter with Botan at the Chichibu Shibazakura Festival. When Botan discovers her drinking alone, she is not put off by Ibuki’s hiccups and expresses a desire to try alcohol for the first time. This interaction sparks a change in Ibuki, as she realizes the potential joy of sharing her love of alcohol with someone who accepts her unconditionally. Her primary motivation evolves from avoiding judgment to seeking a genuine connection, specifically finding a drinking partner who makes her feel comfortable despite her quirks.

Ibuki plays a crucial role in the narrative as the catalyst for Botan’s journey into the world of alcohol. She is the one who offers Botan her first sip of a highball, inadvertently unlocking the protagonist’s bold and uninhibited drunken personality. Beyond this, she acts as a guide to Botan, sharing her knowledge of various alcohols like shochu, whiskey, and wine. Her role in the story is defined by her evolving dynamic with Botan; where Ibuki initially hides her habit, she gradually learns that pleasures are better when shared. Key relationships include her close friendship with Botan, who helps her overcome her self-consciousness, as well as a connection with a graduate student named Kanade Gujo. Kanade is concerned about Ibuki and harbors romantic feelings for her, watching with a mix of disappointment and jealousy as Ibuki grows closer to Botan.

Regarding character development, Ibuki transitions from a lonely dorm leader who isolates herself due to insecurity to a more open individual learning to bond with her peers. While Botan’s personality blossoms under the influence of alcohol, Ibuki develops emotionally by witnessing Botan’s cheerful and uninhibited approach to drinking. She begins to reconsider her rigid habits, as shown when she accepts Botan’s invitation and starts to drop her guarded demeanor. Her development is tied to learning that vulnerability can lead to deeper companionship.

Ibuki does not possess supernatural or combat abilities, but she has a few notable personal traits. Her most defining physical quirk is the hiccups she gets whenever she drinks alcohol. She also has a high level of expertise regarding alcoholic beverages, including their culture and proper pairings, which allows her to educate her younger dorm mates. Additionally, as the dorm president, she demonstrates organizational responsibility and authority within the living quarters, providing a stable presence that contrasts with the more chaotic energy of the other characters.