Aqua Soul

Aqua Soul (アクアソウル), known as Spout Soul in the MegaMan NT Warrior Axess anime dub, is the Double Soul MegaMan.EXE performs with AquaMan.EXE. It only appears in MegaMan Battle Network 4: Blue Moon

Game
MegaMan acquires Aqua Soul during the first tournament of the game. MegaMan is matched up against AquaMan and Lan and MegaMan befriend AquaMan and his operator Shuko Kido. After getting acquainted, the game shows a conversation between Shuko and her brothers about the brother's earning enough money to replace Shuko's old washing machine. The way that the machine was described however, AquaMan misunderstood and assumed that they were talking about replacing him with another net navi. In his state of being upset, AquaMan ran away from Shuko and began crying alone in the internet. Blinded by his tears, AquaMan took no notice that he was unintentionally flooding the net and in turn shutting down the area. Shuko confronted Lan and MegaMan's help providing him with an item to allow him to survive the damages of the water for a prolonged time. MegaMan found AquaMan and tried to explain the mishap to him but he didn't listen and took off with MegaMan in pursuit. Eventually MegaMan was able to tell AquaMan the full story and AquaMan was quick to restore the net to normal and return to Shuko. After everything was sorted out, AquaMan apologized and they returned to the Den Dome and began their match. When MegaMan proved victorious, his and AquaMan's soul connected providing MegaMan with Aqua Soul.

Abilities
By sacrificing a Water-elemental Battle Chip, MegaMan can activate Aqua Soul. Aqua Soul allows MegaMan to not slide on ice panels. By charging a water-elemental Battle Chip, the chip power will be doubled. Also, the megabuster increases charging speed drastically, no matter what program MegaMan has equipped.
 * Charge Shot: Bubbler / Bubble Shot (a Bubbler that deals 20 water-elemental damage)
 * Weakness: Aqua Soul takes twice damage from electric-based attacks. Also, the Bubbler, like the ZapRing, is pretty weak and unlike other Double Soul charge shot, all the Bubbler does is flinch the enemy.