Ikuno Komaki is the younger sister of Manaka Komaki. Afflicted by a chronic illness requiring long-term hospitalization during the original ToHeart2 narrative, she was confined to a hospital bed. Her condition later improves significantly in subsequent installments like ToHeart2 AnotherDays and related media, gaining enough mobility to attend school using a wheelchair. She retains this wheelchair use, indicating persistent physical challenges.

Physically slim and pale, she stands 151 cm tall, bearing brown hair styled in a long ponytail with spiky bangs and blue eyes. She was born on March 3. Her personality merges sharp-tongued sarcasm with underlying pessimism and a fiercely protective instinct, particularly towards her sister. She frequently engages in teasing behavior and displays a self-aware, genre-savvy perspective, often dissecting character archetypes during narrative moments.

Within ToHeart2 adnext, she actively observes and comments on events surrounding her sister Manaka's interactions with Takaaki Kouno, scrutinizing their developing relationship dynamics. Her role expands substantially in ToHeart2 AnotherDays, transitioning from a side character to a protagonist with her own dedicated narrative route written by scenario writer Makura Nagare. This route explores her daily life, school experiences, and interactions extending beyond her illness, focusing on her personal journey and relationships within the school environment.

Her background consistently involves overcoming adversity linked to her health, including experiences with surgery, guilt, and the psychological impact of prolonged hospitalization. While achieving greater independence and social integration, her disability remains a consistent aspect across all appearances, including OVA adaptations. She does not pursue a romantic relationship with protagonist Takaaki Kouno in her AnotherDays route.