Nachu is a female Cocotama, a small god born from the spirit of a syringe, and her egg in the toy line is light blue. She is described as a light blue deer-like Cocotama who hails from the northern area of Japan and is sometimes referred to as the Syringe Goddess. Her personality is primarily stoic and stern, but beneath this serious exterior lies a more excitable and sometimes worried nature. A defining trait is her intense love of hard rock music; when she hears or performs rock music, or when she encounters the group Two-Me-Key, her demeanor undergoes a dramatic shift, becoming highly enthusiastic and lively. She enjoys rocking out with DokuDoctor, another Cocotama. In the story of Kira Kira Happy Hirake! Cocotama, she appears as a supporting character, notably joining other Cocotamas from the previous series to assist the main characters during the final episode. Her role is small but memorable, and her development is limited, centering around the contrast between her cool exterior and her passionate love for music. As with all Cocotamas, she can cast magic by saying the incantation Cocon Poipoi Cocottama, though her specific spells are not highlighted in the series.