Also known as: AA2153
The main protagonist of Cells at Work: Code Black. He is a Red Blood Cell (Hataraku Saibou). Like his female counterpart AE-3803 from the original Hataraku Saibou series, he also has an Ahoge on the right side of his hair, but his hair is brown instead of red.
He is friends with AC-1677 and frequently runs into White Blood Cell (Hataraku Saibou) U-1196.