Ikuno Komaki, younger sister to Manaka Komaki, grapples with a chronic illness that begins with prolonged hospitalization before her health stabilizes enough for temporary outings—such as beach trips with her sister and friends. Frequent medical interventions, including surgeries, punctuate her life, and she eventually relies on a wheelchair for mobility outside the hospital.

Her personality melds sharp-tongued sarcasm with a fiercely protective nature, especially toward Manaka. Though prone to teasing, her biting humor veils vulnerability shaped by ongoing health battles. Despite a pessimistic outlook, she actively champions Manaka’s romantic endeavors, revealing a layered blend of guarded emotions and selfless devotion.

In *ToHeart2 Another Days*, her narrative broadens to encompass school life, where she navigates social dynamics and academic pressures while adapting to her disability—a stark transition from her once-restricted hospital existence. The spin-off *Manaka de Ikuno!!* delves deeper into her bond with Manaka and her determination to carve autonomy amid her condition.

Petite in stature, Ikuno sports brown hair in a long ponytail, blue eyes, and a pallid complexion. She often wears a sailor-style uniform paired with ankle socks and loafers. Her wheelchair, a constant companion in later arcs, features functional intricacies like movable wheels and footrests.

Central to her background are themes of guilt stemming from her condition’s toll on her family, particularly Manaka. Story arcs trace her emotional evolution, intertwining caustic wit with introspective reflections on her future and connections to others.