AE3803

AE3803, Red Blood Cell (Sekkekkyū (赤血球)) is one of the main protagonist in Cells at Work!

She is a new red blood cell who is unfamiliar with the blood vessels, causing her to get lost often while delivering goods. Her main task is to deliver oxygen, carbon dioxide and nutrients all over the body like the rest of her kind.

Appearance
She is an average sized red blood cell with amber brown eyes and short red hair with an ahoge lock pointing outwards. She wears the red blood cell uniform.

Personality
AE3803 is a determined yet scatter-brained red blood cell who's complete lack of direction often gets in the way of her deliveries. Despite this, she is devoted to her job and thus works hard to become as reliable as her peers, though this does not stop her from getting lost. When talking with others, she is very lively and cheery, and is always willing to offer help to those who need it. She is also overly apologetic due all the mistakes she makes and is easily frightened, whether it be invading germs or even other cells. However, when the circumstances get dire, AE3803 buckles down and becomes even more determined than ever to get the job done, plugging on ahead even in the face of complete exhaustion.

History
AE3803 was suggested and chosen to be a red blood cell because she was born with red hair. After sorting, she was raised with other erythroblasts in the bone marrow. Due to her clumsy nature, she was teased by her classmates.

During a training session consisting on escape practice, she accidentally ran off too far and got lost in the bone marrow. As she wandered further, she was caught and chased by a pseudomonas aeruginosa bacteria. A myelocyte (presumably young U-1146) jumped in to save her despite being no match for the bacteria. The bacteria toyed with the young cells unknowingly long enough for help to arrive. A neutrophil killed the bacteria immediately and the two were brought back into their specific bone marrows. Before they left, they agreed to meet each other again even though the chances of reunion were unknown.

After all her efforts and training, she went through enucleation and officially became a full-fledged red blood cell. AA5100 would help her navigate through the body and correctly perform her job. Despite AA5100's help, AE3803 often got lost and had trouble with performing her job, often requiring her senpai's help or was secretly assisted by U-1146. Eventually, AA5100 decided to make her a senpai by having her teach NT4201 the basics of their job, which she successfully did by showing her the values of work experience.

Abilities
As a red blood cell, she is a worker that is unable to protect herself. Therefore her job is to only transport goods.
 * Overall Abilities: Despite having no abilities to defend herself, she is capable of transporting goods into all corners of the body with high acceleration.
 * 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.

Trivia

 * All red blood cells are red because they contain hemoglobin. However, AE3803 seems to be the only RBC to have red hair.
 * AE3803's cresent-shaped ahoge (single lock of hair that sticks out) is an indicator that AE3803 is possibly a sickle cell due to the similarity of the shapes. Her tendency to get easily confused and lost is similar to that of real life sickle cells, who often have difficulty delivering oxygen.