Planescape/YMMV

Crazy Awesome: The Xaositects' speciality. They live in frequent flash-mobs where any number of them from one to "everyone able" may go hurl wild magic at Hardhead patrols or make a great art piece just because one of them felt like it at the moment and others thought it was a great idea. The Revolutionary League infiltrates other factions with a subversive intent? A Xaositect infiltrated them for years -- just for lulz.
Follow the Leader: The whole Faction system was inspired by the Clan system in the popular - at the time - RPG Vampire: The Masquerade.
Magnificent Bastard: Duke Rowan Darkwood, the factol of the Fated, instigated the Faction War and afterward became one of the few people to ever escape from the Lady of Pain's mazes (The Nameless One and Ravel Puzzlewell being two others).
- Although she definitely got the last laugh.
Nightmare Fuel: All of the Lower Planes. Nightmare Fuel can appear in other places throughout the setting as well.
Moral Event Horizon: Rowan Darkwood. His plans to instigate the Faction War involved taking control over the Mercykillers. He couldn't do that without seducing Alishon Nilesia, who while being a Knight Templar, was a 16-years old girl. After winning her heart, he persuaded her to marry him and involve him in her faction's chain of command. Then he sold her into slavery to the fiends.