New to planescape.
What are some good race/faction NPCs that can help introduce the players to the planescape setting?
I've already created a modron outcast fighter, now I need another faction/race to use.
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The modron isn't necessarily part of a faction, though they're often found in the Fraternity.
Tiefling is probably the next best example of the variety of races in Sigil. A devout cleric of some merciful power (a convenient healer for the PCs, perhaps) and Godsman -- he considers himself to have been born into a higher form than his fiendish progenitor, and looks forward to future improving rebirths.