Aqua

Aqua is a character in Tales of Symphonia: Dawn of the New World, and is one of the antagonists. She is the Centurion of Water, and therefore can control monsters with the element water. Like Richter, she wants to regain and destroy Ratatosk's core. Although she tolerates Emil as long as he helps Richter, she is abrasive and fond of yelling at Tenebrae, a fellow Centurion; she often calls him "spiteful Tenebrae."

Before the dawn
Before the events of the game, two scientists named Aster and Richter Abend discovered and woke Aqua at her altar. They told her that they had formulated a hypothesis that monsters were the ones who distributed the world's mana. She offered to guide Richter and Aster to Ratatosk's resting place in the Ginnungagap so that they could persuade him to restore the balance of mana. Unfortunately, Ratatosk's rage at human and elven kind rendered him unwilling to listen, and the visit culminated with Ratatosk murdering Aster. At this point, Aqua lost all faith in Ratatosk and sided with Richter instead. After Richter had killed Ratatosk, Aqua told Richter to destroy the core. However, Tenebrae managed to steal the core and escape.

World in Discord
She and Emil first meet in the Lake Sinoa Cave beside Richter, who tells her to set a monster to drive Emil away. After Emil makes a pact with Ratatosk, however, the monster is defeated, resulting in Aqua weakening in the progress. Afterward, when Emil finds an injured Richter, he goes back to Aqua and asks her to help him. She agrees, telling him that although he is not as cool as Richter, he is okay.

Light and Darkness
Aqua is not seen again until Richter's side-quest in Asgard. During the quest, she almost reveals the truth about Emil's nature, but is silenced by Tenebrae.

After the quest is over, she invites Emil to Triet to help Richter again. On this second quest, she is surprised along with the others when Richter laughs, and says that she has never heard him do so before.

Later on, in the Temple of Ice, she is seen helping Richter when he attempts once again to kill Marta with a stronger monster, but is fooled by the fake Marta of Sheena's creation.

Dark Premonition
Aqua joins Emil and Richter on a third and final side-quest to obtain the Deep Sea Scroll. Like always, she is short-tempered and yells at Emil and Tenebrae often. At this point, both she and Richter suspect that Emil is in fact Ratatosk. After the mission is over, Aqua is not seen again for a while.

Eternal Bond
In the final chapter, Aqua blocks the party from proceeding in the Ginnungagap, and reveals Richter's plan on reviving Aster with the power of the demonic realm. She transforms into a three-headed dragon(hydra) and attacks the party in a boss fight.

After her defeat, she is mortally injured, as she actually took the form of a monster and fought rather than simply controlling one. She transforms into a core and apologizes to Richter for only being able to buy him a little more time. Tenebrae realizes that the reason she helped Richter was because she fell in love with him.

Emil declines to hatch her immediately after her defeat, saying that it would be cruel. Although in reality, he needs it unhatched for his final plan at the gateway to Niflheim. Only near the end of the game does he finally hatch Aqua's core and begin to restore the balance of the world.

During the Perfect Ending, Aqua will together with Tenebrae and Verius tell Emil to live the life he took away from Aster, saying that she will help in the task of making mana no longer necessary for the world, and there after use the remaining mana to make a seal to the door of Niflheim.