Along with the other elementals, Aquans can be encountered in the Amala Network and the Amala Temple, but cannot be recruited. To obtain one as a minion, the Demi-fiend must fuse the appropriate demons of the same race, or get one in exchange for gems at Rag's Jewelry in Ginza.
Shin Megami Tensei IMAGINE
"The name given to elementals who represent the power of water, one of the Four Elements. Water, one of the four elements defined by the alchemist Paracelsus, is ruled by Undine, who is said to be the form that Aquans achieve when they mature."
—Shin Megami Tensei IMAGINE Compendium
Aquans acts as one of the four bosses of the Suginami Tunnels gold instance, as well as an miniboss in the Suginami Unknown boss rush and Makai Distortion.
Shin Megami Tensei: Strange Journey
"This low-level water elemental controls one of the four prime elements that compose the world. According to Aristotle, an Aquans is comprised of "cold" and "moist" essences."
—Shin Megami Tensei: Strange Journey Compendium
Devil Survivor 2
"This low-level water elemental controls one of the four prime elements that compose the world. According to Aristotle, an Aquans is comprised of "cold" and "moist" essences."