Aquias is a vaporeon controlled by Jace.
Very little is known of his past, other than the fact that he seems to know about Jace and Umbreon. This is known because he was revealed to have been hunting for them while terrorizing the residents of Stormy Woods. He proved to be too strong for them to handle, even together.
He is a vaporeon, but looks very old and grizzled. He wears a cloak most of the time to hide his identity.
He has a very proper way of speaking, but carries an authority in his voice. He seems to care somewhat about Jace and Umby, having left them alive and told them to claim his reward from the guild.