Evil Natural Water

Sometime during the raid on the Monster Association, Evil Natural Water comes across Atomic Samurai's three disciples and puts them in a near-death state. Then, when Child Emperor finds the three of them, Iaian warns Child Emperor that Evil Natural Water is still nearby. The monster fires a sharp burst of water, although Child Emperor narrowly dodges the attack. Evil Natural Water is seen battling Child Emperor, with neither one of them gaining a decisive advantage over the other. But then, Evil Natural Water shoots multiple jets of water, destroying Child Emperor's backpack and leaving him vulnerable. He is then momentarily dispersed when Tatsumaki rips the headquarters out of the ground. He then reforms and stands alongside his fellow executive monsters to fight Tatsumaki together. Evil Natural Water transforms itself into a giant dog-like creature and shoots a stream of water at Tatsumaki, which Tatsumaki resists with her psychic barrier.

Later, when King comes onto the battlefield, Evil Natural Water is one of the monsters prepared to fight him. However, Evil Natural Water doesn't budge one bit, which Black Sperm notices, making him believe that King is managing to hid his emotions because Evil Natural Water supposedly reacts to the emotions around him.

As the battle continues and more heroes such as Atomic Samurai, Sweet Mask, Puri-Puri-Prisoner, and Pig God enter the battlefield, and Sweet Mask and Black Sperm are doing battle, Evil Natural Water shoots a burst of water, severing Sweet Mask's arm from his body, although Sweet Mask manages to reattach it to his body. As the battle continues and Sweet Mask fights the multiple Black Sperm copies, Evil Natural Water continues to shoot fast bursts of water, seemingly overwhelming Sweet Mask. Seeing this, Atomic Samurai and Pig God come to aid Sweet Mask, and Evil Natural Water begins to attack Atomic Samurai. Atomic Samurai manages to consecutively dodge the blasts, although Evil Natural Water eventually begins to overwhelm him and Pig God, creating several holes in their bodies. But when it appears Evil Natural Water has victory in its grasp, Tatsumaki comes back to it and sends a large psychic wave, dispersing it into several droplets.

After a while, Evil Natural Water collects all of his water droplets into one and reforms, preparing to attack Saitama. However, Satama disperses it into several droplets all across the battlefield with only a single punch. Despite this, Evil Natural Water is still not dead; it later reappears in a smaller form stabbing Air in the throat. Pig God tries swallowing the creature, and it fires its jets in an attempt to escape, causing Pig God to bleed out of holes all over his body. Eventually, Evil Natural Water is digested by him, signifying his permanent death.

As a high-ranked member and a Dragon-level Mysterious Being of the Monster Association, Evil Natural Water is an extremely powerful being. It was able to confront and overpower three S-Class Heroes (Atomic Samurai, Child Emperor and Pig God) simultaneously. As mentioned by Black Sperm (who heard it by rumor), Evil Natural Water is able to detect the killing intent of those close to it and attack in response.

Physical AbilitiesEdit

Homogenous body: Evil Natural Water's body is made up of water and therefore has no vulnerable internal organs or weak points to target, thus greatly reducing damage taken. Tatsumaki's psychokinesis and Saitama's tremendously powerful punches were able to scatter it into many droplets despite this, but in both cases it survived. Pig God's powerful stomach acids were the only things able to end the life of the Evil Natural Water by dissolving the water.

• Shapeshifting: Due to its entire body being composed of water, Evil Natural Water has great control over its own form; able to appear as a simple blob of water that can transform into a massive monstrous canine form and can imitate body parts such as jaws, and shape part of itself into a large blade.

High-Speed Jet Streams: Evil Natural Water is capable of firing devastating high-speed jets of water in an instant. The jets of water are significantly faster than bullets, fast enough to be almost impossible to track and predict, and have an even higher penetrating power, as one was able to sever Sweet Mask's arm off. The speed of these jet streams are fast and strong enough to overpower even the likes of Atomic Samurai and Pig God.