Armies
The Doomed Crusade - Chaos Army of Malal
A chaos army fighting for the glory of Malal, the forgotten god of chaos
Heroes and Demons
Kaleb Daark (C13 Adventurer)
Chaos Sorcerer on disk of Tzeentch (Motley Maniac)
Skrag the Slaughterer (C23 Ogre described as a servant of Malal in "The Crude, the Mad and the Rusty" scenario in WD #83)
Citadel Compendium “Mark of Chaos” specials, C22 chaos demon, C34 chaos demon
Units
Chaos Centaurs 1 (count as Marauders with mark of Slaanesh)
Enemies
The, erm, Red Brothers.
C13 Jaek and Helwud - The Chaos Brothers
Melniboneans - The Dragon Lords of Imrryr
The decadent, declining civilisation from Michael Moorcock's Elric novels
Dragon Rider (DRAG-7 The Dragon Masters)
Scenarios
The Crude, the Mad and the Rusty
WFB Scenario from White Dwarf #83
Goblin fanatics Blood and Gore and vengeful chaos dwarf Spikes Harvey Wotan
Tinman and Oxy O'Cetylene (LE14)
Skrag the Slaughterer (C23 Ogre)
Spikes Harvey Wotan and his allies advance on Skarg the Slaughterer, the renegade ogre who massacred his tribe
Skarg calmly awaits the onslaught
Other
Regiments of Renown (unpainted)
RR13 Lothern Elf Sea Guard
RR14 Notlob's Orc Artillery