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Oh right, planes.
Not all the Outer Plane-tans have appeared, but those that have made more than a brief appearance:
Mechanus-tan: Syra Archomeda (LN/human/Fraternity of Order), used to be Guvner-tan before she grew up and became obsessed with Mechanus.
Celestia-tan: Liberty (LG/tiefling/Order of Planes-Militant), a tiefling who thought she was hideous and covered up in armour and robes before the PCs came along and it turned out (obviously) that she was really, really good-looking. Another well-meaning paladin but a little less restricted than, say, Aribeth.
Elysium-tan: Real name unknown (NG/aasimar), older lady, spends her time getting drunk and relaxing. One of the strongest magical girls if she's convinced to act, though.
Beastlands-tan: (NG/?/Verdant Guild), one of the Animal Lords of the Beastlands. Specifically she is the Cow Lord and spends her time lazing around a giant barn.
Pandemonium-tan: Used to be a barmy girl in a straightjacket who would attack with a sonic scream and energy knives before Bleaker-tan found out she used to be a Bleaker and went on a quest to restore her mind, which turned her back into Stephanie Pandeaux (NG/planar human (Ortho)/Bleak Cabal) and kind of got her fired. The "new girl" hasn't been met yet.
Abyss-tan: Used to be Abby Heart, a succubus, until she fell in love with a paladin NPC and appealed to the PCs for help. Was eventually kicked out of the Abyss for basically being the worst tanar'ri ever, is now an airheaded classmate of the others. The PCs sabotaged a tanar'ri effort to create a new Abyss-tan in the Fleshforges by filling the forge with chocolates and love.
Carceri-tan: An NE half-tarterian dragon. Name and origin unknown, but the PCs have taken a shine to her for some reason. Tried to force everyone to stay in her tower and hang out with her forever when they passed by while investigating the March, though obviously that didn't go well.