At first, she looks like a beautiful scientist in a blue and red dress with long brown messy hairs, great blue eyes and some glasses ; But it is actually a disguise made with her energy, to hide her true form.

In her true form, 21 has a pink skin, pointing ears and a long tail. Her hairs and eyebrows are white, and her eyes color turns red and black. She also wear clothings simillar as Majin's ones.

She is a sadistic yandere she's clever at hiding it and normally is in her human scientest form