Description
Nonomi Izayoi serves on Abydos High School's Countermeasures Committee. Her emotional and gentle nature provides stability within the group, counterbalancing other members' more extreme personalities. Though unspoken by her, Nonomi hails from wealth as the daughter and heir of the Nephthys Group owner. This background funds most of the committee's snacks through her personal allowance. Her family planned for her to attend Highlander Railroad Academy after Saint Nepthys Middle School. However, after the death of Abydos's Student Council president, she visited the school and met Hoshino, the sole remaining council member. Consumed by guilt over her family group's involvement in the Trans-Desert Project that crippled Abydos financially, Nonomi chose to enroll there instead. This decision strained family ties, though they continue her financial support via a "golden credit card" for personal use.

Physically, Nonomi possesses long pale blonde hair reaching her waist, styled with a side bun on her left, and emerald green eyes. Her halo displays a neon green outer circle, a smaller inner circle, and two earlike projections. She wears a modified Abydos uniform: a white shirt under a beige cardigan with black piping draped loosely off her shoulders, a grey skirt, black socks, and white trainers. An Abydos access badge hangs from her neck on a lanyard, and she dons black tactical gloves. In combat, she wields a customized black-and-white M134 Minigun with green accents and the Abydos insignia. This weapon features a chainsaw grip for portable hip firing and an ammunition box magazine.

Her combat abilities feature the EX Skill "Punishment Time," dealing area damage in a fan-shaped pattern scaling from 432% to 821% of attack power based on skill level. Her Normal Skill "Ta-da! ☆" temporarily boosts her attack by 21.8% to 41.4% every 30 seconds. Passives enhance critical damage ("Tsk Tsk, Shame On You!" from 14% to 26.6%) and grant bonus damage against large enemies ("Squeaky-Clean Sweep" from 6.7% to 12.8% of attack power). The Unique Equipment "Secret Wishlist" augments "Ta-da! ☆" to increase both attack and accuracy at higher tiers. Her Unique Firearm "Little Machine Gun V" significantly enhances passive critical damage capabilities when upgraded, adding flat critical damage values alongside percentage boosts.

Within narratives like the 1.5th Anniversary Short Animation, Nonomi participates in the Foreclosure Task Force's summer activities in Kivotos. During a mall incident where automated turrets caused chaos, she collaborated with her club alongside the Make-Up Work Club, Prefect Team, and Hyakkiyako Alliance Academy to neutralize the threat. Her established role as both emotional support and combat asset remains consistent across depictions.