Fractured Berserkers

Fractured Berserkers (壊カイ人ジン Kaijin?) is a general term for an individual infected by a member of the Parasite species. After dwelling inside a human's nervous system, a parasite uses suppressed desires as sustenance to grow, causing the host to lose all sense of self control, and transform into a beast in the image of their desires and thoughts within seconds called Fractured Berserker Transformation.

Overview
They usually possess superhuman speed, strength and regeneration in this form. When a fractured human is destroyed, the parasite inside the host still lives and will try to escape to find a new host. Once a human has been infected by a parasite, the parasite will enter an incubation period, this period will determine the overall strength of the resulting fractured human by how long the frog is in the incubation period, which is controlled by how much control the host has over his/her desires. This, and many other facts about the parasites, were found out by Misogi Hakuto. The Theory of Peace, as he calls it, suggests that the basic formula of the frenzied frogs feeding side effect goes as (Incubation Period + Control of Desires = Strength as a Fractured Human).