Naive T Saibou

ナイーブＴ細胞

aka Naive T Cell, Naive.

As Naive T Cell, he has a blonde forelock of hair that's just barely visible under his hat, but as Effector T Cell it grows significantly and sticks straight up. His effector T form is heavily referenced from the various protagonists from Jojo's Bizarre Adventure.(Source: Cells at Work Wiki)