She is prudish, extremely serious, and hates just about everything. She is described as 'a very negative bully' and is very quick to hate those whose opinion differs from her in any way. She wears 3D glasses and seems to favor gray and pastel colors in her outfits, particularly light blue. Arisu is a female student with pastel rainbow hair worn in twin drills and heterochromatic eyes (one red, one yellow).
