The Fearsome Well Spirit, Kisume. Ability: The ability to drop will-o'-the-wisps. Species: Tsurube-otoshi. The mid-boss of Stage 1 in Touhou Subterranean Animism. Danger Level: Unknown. Human Friendship Level: Unknown. (*Since neither is officially revealed, I have marked them as 'Unknown'.)

The Bright Net in the Dark Cave, Yamame Kurodani. Ability: The ability to manipulate illness (mainly infectious diseases). Species: Tsuchigumo. Stage 1 Boss of Touhou Subterranean Animism. Danger Level: High. Human Friendship Level: Extremely Low.

Jealousy Beneath the Earth's Crust, Parsee Mizuhashi. Ability: The ability to manipulate jealousy. Species: Hashihime. Stage 2 Boss of Touhou Subterranean Animism. Danger Level: Medium. Human Friendship Level: None.

The Spoken-of Unnatural Phenomenon, Yuugi Hoshiguma. Ability: The ability to possess supernatural strength. Species: Oni. Stage 3 Boss of Touhou Subterranean Animism. Danger Level: Extremely High. Human Friendship Level: Unknown. One of the Four Devas of the Mountain.

The Girl Even the Vengeful Spirits Fear, Satori Komeiji. Ability: The ability to read minds. Species: Satori (Youkai). Stage 4 Boss of Touhou Subterranean Animism. Danger Level: Extremely High. Human Friendship Level: None. "The ability to read minds is truly wonderful. It is the ultimate power that works against any opponent." The Mistress of the Palace of the Earth Spirits.

The Hell's Traffic Accident, Rin Kaenbyou. Ability: The ability to carry away corpses. Species: Youkai (Kasha). Stage 5 Boss of Touhou Subterranean Animism. Danger Level: Low. Human Friendship Level: High. "By killing a human like you, my cart of hellfire gets heavier~♪ Ah, hauling corpses is so much fun!" Satori's pet and a resident of the Palace. Since she is only interested in corpses, she has a 'High' human friendship level, which is rare for an underground youkai. She is called 'Orin.'

Subterranean Sun, Utsuho Reiuji. Ability: The ability to manipulate nuclear fusion. Species: Youkai (Hell Raven & Yatagarasu). Stage 6 Boss of Touhou Subterranean Animism. Danger Level: Unknown (Extremely High from her master's perspective). Human Friendship Level: Unknown (Might increase if you bond?). "That ultimate energy is nuclear fusion! Why don't you fuse with me too?" Like Orin, she is Satori's pet. She is called 'Okuu.' Her catchphrase is "Unyu?"

The Closed Eyes of Love, Koishi Komeiji. Ability: The ability to read minds -> The ability to manipulate the unconscious. Species: Satori (Youkai). Extra Stage Boss of Touhou Subterranean Animism. Danger Level: Unknown (Possibly extremely high in some cases?). Human Friendship Level: None (Might increase if you bond?). "Danmaku lurking in the unconscious. That's a danmaku even my big sister has never seen!" The younger sister of Satori.

The Mastermind Behind the Spiriting Away, Yukari Yakumo. Ability: The ability to manipulate boundaries. Species: Youkai (Gap Youkai). 'She is everywhere.' Danger Level: Unknown. Human Friendship Level: Normal.

Cats, dogs, lions, black panthers, raccoons, shoebills, Komodo dragons, and more.