Zelzel emerges as the magically transformed female identity of Zel, an elf adventurer. This change occurs during a visit to The Genderswap Inn, where consuming a gender-swapping potion alters Zel's physical form while preserving core consciousness and memories. The magic reshapes his juvenile male body into a significantly more curvaceous and voluptuous feminine physique. Zelzel retains Zel's original height of 160 cm but now possesses longer, wavier blonde hair.

Her personality reflects Zel's original traits: a generally stern demeanor and displeased expressions, now presented through a feminine lens. Zelzel's gerontophiliac preferences—attraction to partners perceived as "young" within their species—persist unchanged. Her interests in mana quality and interactions with shorter-lived races also remain.

A documented sexual encounter occurs between Zelzel and Lymee, a slimegirl, at The Genderswap Inn. This experience highlights sensory novelty, with Lymee's fluid composition creating distinct physical sensations. Subsequent reviews rate the encounter an 8.

Zelzel's existence remains confined to this context of magical experimentation at the inn. No further narrative developments, background expansion, appearances in spin-offs, light novels, or other media are documented. There is no indication of recurring use of this form or deeper exploration of identity beyond the inn scenario.