If Colette was an Oni, she would have characteristics that mix her human essence

If Colette was an Oni, she would have characteristics that mix her human essence with demonic traits. Your skin could be pale or have a slight bluish tinge, reflecting her otherworldly nature. Your eyes could have a subtle sparkle, perhaps with irises in shades of blue or silver, suggesting a mysterious depth. Her hair would be long and flow like a silk cascade, possibly in a dark blue shade to complement your kimono. The bamboo in its mouth would be a distinctive accessory, similar to Nezuko's "Demon Slayer," used to control your impulses and remind you of your commitment to do no harm to humans. Her blue kimono with pastel shades would give her an ethereal and elegant look., standing out among other Onis that generally display more menacing looks. Maybe it had subtle floral patterns, symbolizing purity and renewal. Colette could possess Oni abilities, as increased strength, speed, and an accelerated healing factor, but would use these abilities to protect humans and fight other demons. His behavior would be marked by an innate gentleness and a firm determination, demonstrating that even as Oni, she maintains a strong sense of morality and humanity.