In the Buddhist faith, the Four Heavenly Kings are four guardian gods, each of whom watches over one cardinal direction of the world. They reside in the Cāturmahārājika heaven on the lower slopes of Mount Sumeru, which is the lowest of the six worlds of the devas of the Kāmadhātu. They are the protectors of the world and fighters of evil, each able to command a legion of supernatural creatures to protect the Dharma.
Zouchouten (増長天), also known by the Sanskrit name Virūḍhaka, guards the South. His name means "lengthening good deeds among mortals." He has green skin and leads the troop of Kumbhandas and Pretas. His statues usually carry either a sword or polearm.
"Origin: India. One of the 4 Heavenly Kings in Buddhism. He protects Mt. Meru's south and Jambudvipa with a spear. He was originally the chief of the gods and the god of the five grains. Kumbhanda and the Pretas serve him."
—Shin Megami Tensei A-Mode DDS Dictionary
Shin Megami Tensei IMAGINE
"As a Defender of Law, Zouchouten is considered one of the Four Heavenly Kings featured in Buddhism. He holds a spear, and has been assigned by Lord Sakra with protecting the southern domains of Mount Neru. Zouchouten was originally the ruler of the gods. He is considered the God of Harvest and the King of the Kumbhanda."
—Shin Megami Tensei IMAGINE Compendium
Zouchouten appears alongside the other kings in Ichigaya Camp's gold-level instance. He can be summoned by defeating the Kumbhanda mini-boss in the basement levels.
Shin Megami Tensei IV
Zouchouten is faced in the Challenge QuestTokyo Cosmo. He is found in the Oimachi area of Tokyo Bay region. He appears alongside the other three heavenly kings once all four have been defeated to be fought as a group.
Shin Megami Tensei IV Apocalypse
"Zouchouten, or Virudhaka, is one of the Four Heavenly Kings in Buddhist lore. He dwells halfway up Mt. Meru in the center of the world and protects the South under the command of Sakra. He is the god of fertility and agriculture, and affects the growth of all things. He is commonly depicted wearing armor, with a sword in hand and an angry expression on his face."
—Shin Megami Tensei IV Apocalypse compendium
Zouchouten and the rest of the Four Heavenly Kings guard the temples that contain the jars of Aether which maintain the Tokugawa Mandala for the Divine Powers. Zouchouten can be found in the Nansekiji Temple, guarding the jar of Aether which contains the essence of Lust. Defeating Zouchouten will unlock him for fusion in the Cathedral of Shadows.
Zouchouten can teach Nanashi the Agidyne, Dream Fist, Sukunda and Grand Tack skills through his Demon Whisper. He benefits from learning Physical, Gun, Fire, and support skills, however, his tendency to raise his Magic stat at level up will result in greater damage from the Fire skills.
Majin Tensei
Zouchouten is the true identity of the JSDF Minami Ikki, an ally of the protagonist.
Persona 3
"Virudhaka, protector of the South, is one of the four Heavenly Kings in Buddhist myth."
—Persona 3 compendium
Persona 5
"Also known as Virudhaka, he is the protector of the South, and is one of the four Heavenly Kings of Buddhist origin. He is the god of the five grains, and was once the chief of the gods."
—Persona 5 background
DemiKids: Dar/Light Version
" One of the four overlords who protect the world. Known as Lord Nan of the South"
Known as Lord Nan, he can perform the combo Mega Flash with Mega Rox and Lord Sha.
Devil Survivor
Zouchouten (named Zouchou due to character space limits) is one of the four Devas that protect the barrier between the demon and human worlds. On every ending save for Yuzu's, in order to gain access to the demon world (and thus, Babel) the player's party needs to dismantle the barrier that the Devas protect. After Bishamon's defeat, Zouchou challenges the player's party with Koumoku, planning to make up for their lack of power with numbers.
Koumoku and Zouchou are unlocked for fusion after the player defeats them.
Devil Survivor 2
"Zouchouten, or Virudhaka, is one of the Four Heavenly Kings in Buddhist lore. He dwells halfway up Mt. Meru in the center of the world and protects the South under the command of Sakra. He is the god of fertility and agriculture, and affects the growth of all things. He is commonly depicted wearing armor, with a sword in hand and an angry expression on his face."