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DB5963
CHARACTER STATUS
 STATUS Active
 GENDER Male
 SPECIES Red Blood Cell
 OCCUPATION Transporter
DEBUT
 ANIME DEBUT Episode 13
 MANGA DEBUT Chapter 18
VOICED BY
 JAPANESE Takayuki Kondō

DB5963 (credited as Transfused Red Blood Cell 1 (輸血赤血球1 Yuketsu Sekkekyū 1?) in the anime) is a red blood cell that is transfused into the host body of the main series after experiencing massive blood loss. He acts as a leader to the rest of the transfused red blood cells in delivering the oxygen to the rest of the body.

Later on, U-1146 shows him and AE3803 around the small intestine before leaving to get them some tea. He later forgets about them as there is a Campylobacter invasion in the small intestine.