Standing figure of HMX-13 Serio from Go! To! Heart!! R in a dynamic pose, the petite Serio captures her agile charm. The sculpt emphasizes delicate lines and soft curves, with a glossy PVC finish that highlights the character's signature color palette. Her school-girl-inspired uniform is rendered with crisp folds, ruffled sleeves, and tiny accessories that reflect her buoyant personality. The paintwork is clean, with precise shading along the hair and boots, and subtle gloss on the eyes to bring a lively expression to the display.

Serio, designated HMX-13, is a cheerful yet determined member of the ensemble that drives the Go! To! Heart!! R narrative forward. In this age of bright adventures, she balances loyalty to friends with a mischievous streak that keeps every mission lively. Her petite form belies surprising courage during battles against rival teams, where quick footwork and clever tactics turn the tide. Visually, Serio’s arc is tied to themes of friendship, teamwork, and self-belief, as she learns to trust others while embracing her own quirks. The go-to heart power she channels embodies hope, making her a favorite figure within the series' colorful world.