The Naga is an enemy in Final Fantasy IV: The After Years. It is not a big threat to the party, and a single Bio spell will dispatch it. Fira, Blizzara, and Thundara all work decently as well as physical attacks. If damaged by a magic attack and not defeated by it, it will counter with Tongue to inflict Sleep on a random party member.
Naga (Sanskrit: नाग, Nāgá) is a deity of entity taking the form of a great snake—specifically the King Cobra—in Hinduism and Buddhism. For female counterparts, they're called nagi.