Also known as: ag2357
A Red Blood Cell (Hataraku Saibou) from the Hataraku Saibou BLACK spinoff series. He is a senior to the main character AA-2153 to whom he acts harshly due to having a cynical nature from working in an unhealthy body. He has Purple Hair and Black Eyes.
The name "AG-2357" seems to be unconfirmed and some sources simply call him "Purple-haired red blood cell".