Cancer Cell

Cancer Cell (がん細胞, Gansaibō) is a recurring antagonist in Cells at Work!

He was born mutated because the normal cell who grew him made a copying error in his DNA. His mutation causes him to appear different from normal cells and to replicate uncontrollably, causing potentially deadly cancer.

He was killed by U-1146 twice. It is still uncertain that he will remain dead or return.

Appearance
Cancer Cell's hair is dark when in disguise and light in his true form, his right eye has a black sclera. There are growths on his skin (most notably his cheeks) that resemble bulging veins. His body is constantly changing shape, size, and number of limbs. He wears a normal cell outfit.

Personality
Cancer Cell is immature and idealistic. He believes it would be better to let cancer grow and kill the host body than for immune cells to kill cancer cells because cancer cells did not choose to be born with a defect. He has a fondness for U-1146 for protecting him from another cancer cell when he was disguised as a normal cell, and for showing a "kind-hearted" demeanor despite his purpose of killing threats to the body. He hates other immune cells.

Abilities
The full abilities of Cancer Cell is unknown, his power seems to grow stronger on bacteria toxins.
 * Combat Proficiency: Cancer Cell is a formidable opponent to immune cells. He fights hand-to-hand without a weapon.
 * Shapeshifting Mutation: He can dramatically change size and shape at will to help him fight and overpower immune cells.
 * Metastasis: When he wants to spread cancer throughout the body, he grows feathered wings for fast travel.
 * Recurrence: Cancer Cell was able to "resurrect" with his memories intact after his genes were leaked.
 * Regeneration: He is able to regenerate and heal any injured parts of his body if the received attacks is not fatal.