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. Later AquaMan gets upset because he thinks that Shuko is going to replace him although she was really going to replace her washing machine. He floods the Net but Lan and MegaMan go to help him. 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.
 * 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.
 * Bosses to use against:
 * BurnerMan.EXE - His weakness to Aqua attacks combined with the double damage chip charge means that he takes 4x damage from a single Aqua chip.

Anime
In the anime, AquaMan develops an obsession with MegaMan after he saves him from Viruses. He follows MegaMan around everywhere, even when BurnerMan.EXE challenges to a Netbattle. During the battle, MegaMan gets injured and AquaMan feels bad for getting in his way. Their souls resonate and MegaMan gets Aqua Soul which he uses to delete BurnerMan.