"Elements of the mountains. Their name means "lurking souls." They are sometimes identified with the kodama. Sudama are born from the pure essence of the rocks and trees of lush, green mountains where few humans have set foot. They are said to live in huge, ancient trees and giant, ageless boulders. Sudama never cause trouble, and sometimes take human shape in order to watch over their mountain homes. Tradition holds that when you are in the mountains and get the feeling you are being watched, it is a Sudama watching you."
—Shin Megami Tensei IMAGINE compendium
Sudama appear regularly in the Shibuya field and the Shibuya-based Quartz instance. Within Quartz, there is a variant that uses a powerful suicide attack.
"A spirit of rivers and mountains in Japanese lore. Over long periods of time, they dwell in trees and rocks. They are not evil, but they watch over the mountains and appear as humans or supernatural wonders to warn people"
Sudama can initially be encountered in the government office plaza area of Shinjuku while it is being occupied by the Jirae demons and later in Shibuya. Flynn must have the Demolingual App in order to converse with Sudama. It can teach Flynn the Shock and Pulinpa skills through its Demon Whisper.
"A spirit of rivers and mountains in Japanese lore, they dwell in ancient trees and ageless rocks. They are not evil, and will often appear as humans or supernatural wonders to warn people."
—Persona 5 background
Sudama is the fourth Persona of the Hermit Arcana and can be found as a Shadow in the Chemdah area of Mementos, with the title "Noisy Mountain Spirit." It is one of four Personas to learn the Magaru skill and one of three Personas to learn Lucky Punch. Sudama is the first Persona to learn the Ambient Aid skill, but as it does not have its own bad status inflicting skills, they will need to be supplied through fusion. Sudama is the first Persona that the protagonist can use in battle that learns the Garula skill. When itemized through Electric Chair execution in the Velvet Room, Sudama yields a Magaru skill card. Sudama is one of the ingredients needed to create a Neko Shogun in advanced fusion for the StrengthConfidant with Caroline and Justine.