|SPECIES||Red Blood Cell|
|ANIME DEBUT||Episode 13|
|MANGA DEBUT||Chapter 18|
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.
As a red blood cell, he is a worker that is unable to protect himself. Therefore his job is to only transport goods.
- Overall Abilities: Despite having no abilities to defend himself, he is capable of transporting goods into all corners of the body with high acceleration. ShHe's even adept at getting through incredibly tight spaces, albeit with considerable difficulty.
- 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.