Description
Discovered by Miki Hoshii on a park bench during a tropical island vacation, Chihyaa reacted with immediate hostility toward Miki due to her larger chest size, latching onto her arm. Island residents, viewing Chihyaa as a nuisance, incentivized Miki with onigiri to take her away. Transported inside Miki’s luggage to 765 Production’s office, Chihyaa was formally named by Ritsuko Akizuki and assigned to Chihaya Kisaragi. Chihaya initially resisted this responsibility but formed a lasting bond, leading to Chihyaa’s permanent residence with her.

Resembling a miniature super-deformed Chihaya Kisaragi, Chihyaa possesses distinctive bright blue eyes—unlike Chihaya’s brown eyes and unique among Puchidols relative to their idols. She undergoes dramatic seasonal changes: her hair grows long and shaggy in winter, forming cat-like ears atop her head. Cut hair regrows completely within a day during this season. Her vocalizations include "Kuh!" for general communication and "Shaa!" as a threat toward larger-chested individuals. Despite limited sounds, she sings enka-style songs using "Kuh!" variations while holding a small microphone. She perpetually wears a blue dress matching her hair.

Chihyaa displays intense aversion toward larger-busted individuals, frequently hissing or biting them. Miki Hoshii remains a primary target due to their first encounter, and this hostility extends to idols like Azusa Miura—especially during forced contact like sitting on Azusa’s lap. Ritsuko Akizuki alone escapes aggression, likely due to early feeding and kindness. Chihyaa expresses affection by climbing onto Chihaya’s or Ritsuko’s head and rhythmically patting it, conveying fondness and basic communication. She handles complex tasks like navigating cities solo to deliver sheet music to Chihaya and communicates effectively by phone.

Living with Chihaya presented unique adaptations. During their first winter, Chihyaa’s rapidly regrowing hair caused Chihaya to choke in her sleep since Chihyaa slept on her face; Chihaya eventually adjusted. Chihyaa consumes multiple milk cartons daily—a preference humorously linked to a Japanese urban legend about milk and breast growth. This obsession once led her to direct Miurasan to teleport herself and other Puchidols to a cow for milk. She intensely dislikes water, sinking instantly in pools or oceans and unable to swim. Chihaya’s recurring attempts to rename her "Gonzalez" became a running gag, though the name never persisted.