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
Aquans can be fused from any two Yomas.
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."