Kalran: Tales of the four nations/Penitent trooper

Tactical analysis

 * A chance for atonement: Made from criminals, or even those against the governments rules. The Penitent trooper are the basic penitent soldiers of the government. Fused to armored diving suits. The Penitent trooper armor, and numbness towards pain, makes them on par with other heavy infantry, capable of shrugging off small arms, but the weight of their suit makes them slow and unable to swim, but they can simply wade underwater. While their rivet gun and wrist-mounted needle can punch through infantry and light vehicle armor
 * Dead woman walking: Penitent trooper are prepared to fight to the death against their foes, and will never retreat even when their morale breaks. And can, with a shot of adrenaline, charge headlong towards their foe, the impact often knocking infantry off their feet and stunning vehicles, while charging into garrisons often kills any foes inside even if it means sustaining lethal injuries in the process, all to atone for their past sins
 * Just an enforcer: Penitent troopers, despite their armor and deadly weapons, are pretty slow and their weapons aren't effective against tank armor and can't hit aircraft
 * This is a drill: Troopers who went through theatres of war, showing their devotion to atonement and little thought of rebelling, are known to be to be trusted with having their wrist blade replaced with a high-powered drill, which creates a projectile repelling gust when spun, and the rivet gun upgraded with improved clockwork, increasing its rate of fire, and superheated rivets, burning the target upon impact afterwards

Overview
The Penitent trooper are those who defied the Government. And as punishment their body, sans their head, is fused to their armored diving suit, which is based of the Alpha big daddy from bioshock 2. Underneath their helmet they are bald, and their face partially rotting and covered in an array of scars, with the most noticeable being a huge lobotomy scar.

History
The Penitent trooper are the basic penitent soldier, consisting or Nekomatas with an higher aptitude in strength or previous career in the military, but unlike the other penitent soldiers they are the only soldier that can remove their helmet, though the modifications they go through means that even a breeze grazing upon their damaged flesh feels like hot knives flaying their skin.

Once their procedure is complete they became the workers and soldiers for the Government, whether it be guarding a convoy or fixing a ship, and in war are the main soldiers of Ouroboros, their rivet gun capable of punching through flesh just as good as bronze while shrugging off anything short of an autocannon.

Ace upgrade
Units melee weapon is replaced with a drill, increasing melee damage, effectiveness against tank armor, and charge now gives them resistance to ranged attacks, and superheated rivet gun, with increased rate of fire and range attacks now dealing afterburn damage