U-2001

 is a minor character in Cells at Work!.

He is a Neutrophil working under the Neutrophil Division, and a close friend of U-1146, along with U-4989, U-2626 and U-2048. As a neutrophil, his purpose is to destroy bacteria invading the body.

Appearance
He has extremely pale skin and hair like the other neutrophils. He wears the neutrophil uniform. He has black eyes and his hair appears to be in a buzz cut.