『Naive T Saibou』

T Cell that has never come across an antigen. Views Killer T Cells and Memory T Cells as his seniors.

In episode 3, with the help of Jujousaibou/Dendritic Cell, Naive T Cell is inspired and literally activated, and transforms into a very manly Killer T Cell. He is subsequently beat up by a new Type A virus, and reverts back to his old self.