Isami Aldini, fraternal twin to Takumi Aldini, belongs to a Japanese-Italian family rooted in Italy, where both brothers honed their culinary craft at the family’s Trattoria Aldini. Though overshadowed by Takumi’s culinary prowess, Isami’s competence in other areas fueled a childhood inferiority complex, culminating in an impulsive alteration of Takumi’s dish that drew their father’s reproach. Takumi’s subsequent reassurance forged a deeper bond, solidifying their shared mission to elevate the family restaurant. Isami’s physique shifts seasonally—rounder in winter, leaner in summer—with peers noting his taller stature and spiky brown hair. High-pressure events like the Tōtsuki Autumn Election intensify his weight loss, narrowing the visual gap between him and Takumi. Calm and cheerful, Isami balances Takumi’s intensity with steady support, often lightening tense moments with playful teasing. Though content as Takumi’s sous chef, his loyalty and quiet resolve stem from a vow to propel his brother’s success while carving his own path. A master of Italian-Japanese fusion, Isami wields the mezzaluna with precision, crafting innovative dishes like the Curry Bread Calzone and collaborating on creations such as the Aigamo Grilled Duck. His evolution from a supportive role to an independent contender earns him a seat on the Elite Ten Council by his third year. Key milestones—his symbolic weight loss during the Autumn Election, aiding Sōma Yukihira at the Moon Banquet Festival, and his dual focus on bolstering Takumi while refining his culinary voice—underscore his journey. Together, the twins strive to transform Trattoria Aldini into a global culinary landmark.