I have a rather good-sized collection of Dragon Magazines, and I've always been very interested in the Class Acts at the back of the magazine. Now that I've come into Planescape, I've been wondering; of all the various variant classes in my collection, which ones could actally be integrated into a Planescape campaign, and how could they be integrated? Can anyone help me answer these questions? Below is the complete list of the variant classes in my collection, each accompanied by a "blurb" that summarises the difference between it and the original.
Sidhe Scholar- an intellectual variant Druid; a scholar who gains divine powers by studying and drawing upon the power of the "Sidhe"; the Seelie and Unseelie courts. (From the way the article was written, it also seems that the Sidhe Scholar doesn't have an alignment restriction like the normal Druid.)
Wild Monk- a variant, Lawful Neutral only Monk who studies the ways of nature- eventually gaining the ability of Wild Shape, like a Druid.
Wild Defender- essentially a hybrid of Ranger and Paladin who must be Neutral Good or any Morally Neutral alignment.
Filidh- a variant Wizard; a lorekeepr from a barbarian society. Gains Bardic Knowledge and bonuses to casting Divination.
Anagakok- like the Filidh, this is a variant Wizard from a barbarian society; can't learn Illusion or Necromancy spells, but gains access to certain Druidic spells.
Chaos Monk- a variant Monk who must be Chaotic rather than Lawful, gaining powers thanks to its ties to chaos, such as Flailing Strike rather than Flurry of Blows.
Totem Druid- a variant Druid who draws its powers from a single totemic animal spirit.
Harbinger- a variant Bard of Nonlawful Nongood alignment who uses its music to cause fear, doubt, despair and bad luck amongst its foes.
Mystic Ranger- a variant Ranger (must be Nonevil in alignment) who focuses more on the spiritual side of its discipline- granting it access to more spells and to begin learning magic from the first level.
Rage Cleric- a frenzied variant Cleric who embraces its patron diety with passionate fury; this lets it Rage like a Barbarian at the cost of being unable to be of Lawful alignment.
The planes are a big place and all of these classes conceivably have a place in it. The nature oriented classes, as well as the filidh and anagakok wouldn't be likely be living in Sigil; but the nature oriented classes would definitely have a place in the Outlands and Beastlands among other places and the barbarian wizard classes would definitely have a place in Ysgard. The mystic ranger I think would probably be quite common among the planes and the chaos monk would have a very interesting place among the githzerai in Limbo