Holmy, a female Myumon of the cow tribe, is the disciplined vocalist and bassist of the idol group Criticrista, wielding her instrument, the "Holstein Bell Bell♢." Her striking appearance features a white bovine frame accented by crimson eyes, short muted-brown hair, golden horns, and cow ears and tail subtly darker than her fur. She dons a red headband, a white-and-red top adorned with a striped bow, a pleated skirt, and a flowing cape embellished with diamond motifs. Alternate personas include a shadowy "dark form," a "MofuMofu" variant clad in soft pink fluff, and a "Wedding Form" complete with a lace veil and tiara.

As student council president at St. Midi Girl's Academy, she balances stern authority with quiet empathy, channeling her resolve to mentor her free-spirited bandmates—Rosia, Tsukino, and Jacklyn—while navigating their shared duties as students and performers. Her journey to the academy’s elite entertainment program followed grueling underground training, where her relentless dedication to music eclipsed early academic struggles.

Within Criticrista’s vocal tag team, Holmy embodies the diamond suit, collaborating equally with her peers under the group’s card-themed identity. Her dynamic with rival Peipain remains undefined, yet her loyalty to her bandmates anchors their collective efforts to harmonize stage commitments with school life. No expanded lore beyond her core role and traits is documented in ancillary media.