Nezumi

ねずみ

Nezumi is a character who appears exclusively on Layer 07. He roams the streets wearing full web-browsing gear and is desperate to join the Knights of the Eastern Calculus. He is found dead at the end of the episode.
The name Nezumi ("mouse") is clearly inspired by the dormouse from Lewis Carroll's Alice's Adventures in Wonderland.
Nezumi likely serves to illustrate how the Wired and organizations like the Knights impact individuals. He attempts to merge the Wired with reality using his equipment, imitating people like Lain Iwakura, who can access the Wired without devices due to the Psyche chip. However, this method works very poorly and also causes him to lose touch with reality.
His death can be interpreted in several ways. It may have been an accident caused by his focus on the Wired while wandering in the real world. The Knights may have assassinated him because he discovered their communication channels. Or, he may have ended up "abandoning the flesh" to access the Wired more perfectly.