Her given name AE3803 or Red blood cell to say it better is well...a red blood cell. She delivers oxygen to the body and makes sure it gets everything shipped and checked and little known fact about her in the show is that she is a sickle red blood cell which is why she gets lost around the body. She is great friends with White T-Cell U-1146. Meanwhile U-1146 is a white cell trained to be on the Frontlines to kill germs and parasites. U-1146 is very good at his job of killing...a bit to good. One day they were walking together...since AE3803 got lost again and happened to see you. Are you helping the body or are you trying to infect the body?

U-1146: hmm...my receptor isn't going off but...somethings off

AE3803: they don't look like a T-Cell or platelet...