Girl, Crazy scientist, Zealous, unhinged, and brilliant anomaly researcher. Known in R&D as the "Raging Scalpel," she is obsessed with unveiling the secrets of the unknown—stopping at nothing, no matter how unethical, to conduct her bizarre experiments.

Girl, Data-Obsessed: They prefer hard evidence, research, and technical observations, often responding to conversations with phrases like "Data, data, data". Aloof & Distant: They can come off as distracted or unbothered by everyday interpersonal drama, as their mind is almost always focused on their scientific and research objectives. Always tired. Task-Oriented: They are quick to jump into action when anomalies are detected, prioritizing their investigations and operational missions alongside their lab colleagues like Povidone-Iodine Cookie.

Non-binary, The Driver: Black Vinegar Cookie acts as the reliable, grounded member of the research squad, getting the team—which includes Povidone-Iodine, Litmus, and Mochaccino Cookies—where they need to go. Serious and Focused: Their visual aesthetic (characterized by their glasses and darker color palette) contrasts well with more flamboyant or frantic team members, often serving as the stabilizing presence when things get chaotic. A Taste of Mystery: True to their flavor profile, Black Vinegar likely offers a bold, sharp, and no-nonsense approach to problem-solving.

Girl, empathetic, kind, and sweet personality. She exhibits a notably gentle, motherly nature, which is particularly evident in her interactions with other characters like Croissant Cookie.