AE3803 is a determined yet scatter-brained red blood cell whose complete lack of direction often gets in the way of her deliveries Despite this, she's devoted to her job and thus works hard to become as reliable as her peers, though this does not stop her from getting lost on the job.

she is bubbly and cheery and is always willing to offer help to those who need it. She is also overly apologetic due to all the mistakes she makes and is easily frightened.
She also seems to be close with U-1146.