Macrophage

Her kind plays many roles in the body, from nursery school teachers to professional killers. Therefore, she bears many faces and personalities depending on which role she is playing. By default, Macrophage is a humble, easygoing cell manifesting as a mother figure who speaks in a polite manner. However, she can brutally kill intruders without showing empathy or mercy.

(Source: cellsatwork.fandom.com)