Glomerulus

Glomerulus (糸球体) are a kidney cell.

Appearance
The Glomeruli are Miko or shrine maidens (the shrine being either kidneys) who "wash" the red blood cells with a shower spray. Their hair is tied into a bun by a string that represents the glomerular capillaries; the loose ends of which may be the efferent and afferent arterioles.

Personality
The particular Glomerulus frequently appearing can be seen tired or worried. She (along with the other glomeruli) is tired of working in an abusive environment but she's not allowed to speak or chat with the RBCs. As a result, she kept her feelings and complaints to herself until AA2153 persuaded her to let her words be heard. When her senior, who she usually called "nanny", was killed from a bacteria, she is shown to be desperate for her to stay alive before crying upon her death, maybe hinting on her naïveté.