Kyosei

Labeled as a delinquent and bad influence, high school student Kyosei Ichinose choose to stay out of the people around him, indulge himself to his headphones, pick fights against other people and stay alone. 

He was later famous for being a dangerous fellow that even his fellow students and his teachers feared him.

One day, everything is normal until the world is now in turmoil after the appearance of a mysterious disease that turns humans into mindless cannibals, infecting humans all around the country in an alarming state.

After receiving a distressed message from his former friend, he reluctantly returned only to find the school overrun by the dead. Armed with his house keys, a revolver and a duffel bag containing a few items to aid the rescue, he returned to the school without knowing why he still need to rescue a former friend.

Outbreak Chronicles: Dead Pandemic

Equipment: Melee: Piyavka Machete, Piyavka Cleaver

Kato is in dire need of help. He is now undergoing the mutation and if things got worse, he will turn into a variant just like how it happened with Kaze turning him into a Juggernaut.

I can tell that the infection in his body was undetected but he could get infected during the last battle against the Hammerhead. If the virus of the Hammerhead can be transmitted not only by a bite but also by its attacks, that means that must be the reason why his infection is slow and because his limbs that were affected were amputated to save him, it won't be a far fetched theory if he still has a remnant of the virus and only got to mature slowly in his body, causing him to remain as an uninfected individual before.

As I was thinking of something to do, I saw Izayoi and the two variants rushing in our direction.

The Hunt for the Deadly Core