AA5100

AA5100, Senior Red Blood Cell (先輩赤血球) is a minor character in Cells at Work!

She is a older red blood cell with decent working experience in the blood vessels. She sometimes guides and teaches AE3803 how to do her job when she is confused or lost.

AA5100 is seen after the hemorrhage event in the final episode, running towards AE3803 with a flustered look after the latter mistakenly spoke to ME0808 thinking she was NT4201.

Abilities
As a red blood cell, she is a worker that is unable to protect herself. Therefore her job is to only transport goods. AA5100
 * Overall Abilities: Despite having no abilities to defend herself, she is capable of transporting goods into all corners of the body with high acceleration. She's even adept at getting through incredibly tight spaces, albeit with considerable difficulty.
 * Reversible Jacket: All red blood cells wear a reversible jacket that helps them indicate their speed when moving around in either veins or arteries. The jacket has extendable sleeves and zips up for colder weather.