Yona Ichōgi operates as a member of the HxEros Tokyo Branch defense team. She possesses long dark brown hair, brown eyes, and distinctive glasses, and acts as a mediator within the team during operations and internal interactions. Her H-energy uniquely stems from sensations of immorality, setting her apart from her teammates. She conceals her XEro transformation device within the hair bow accessory she wears. Specific combat techniques or transformation sequences are not detailed. In the series' inaugural character popularity poll, she achieved 15th place with 457 votes.

Her background, history prior to HxEros, family, and personal life outside the team remain undocumented. She experiences no depicted narrative development, character growth, or evolution across the series, maintaining a steadfast supporting role within the Tokyo unit without expanded focus or individual arcs. She appears exclusively within the main series, with no presence in original video animations, spin-offs, or supplemental materials.