Slaaneshi DLC: Supposition
Hypothetical Slaaneshi portion of the next DLC we're going to get from Warhammer 3. Unsurprisingly, the Dark Prince has been shafted yet again and N'kari is currently the only Slaaneshi faction specific Lord for Campaign.
The Masque of Slaanesh (Daemons of Chaos Lorebooks) - Eternal Masquerade
Strykaar of the Sortsvinaer (Liber Chaotica / Storm of Chaos) - Perfection's Favoured
Dechala the Denied ( Liber Chaotica / Storm of Chaos ) - The Denied Ones
Nastasya Roskolnikov (The Citadel Journal's, Issue 20)
Agrammon the Cagelord (Everchosen Book Series)
Sorceror Lord of Slaanesh
Slaangors ( White Dwarf ) - Javelin Infantry
[⭐ROR UNIT] - Agrammon's Beastfiends of Excess (Slaangors)
Serpent-Steeds of Slaanesh ( White Dwarf ) - Light Calvary
Hounds of Excess ( Everchosen Book Series)- War Beasts
[⭐ROR UNIT] - Vale Hound of Slaanesh (Hounds of Excess)
Thirsting Valespawn (Tome of Corruption***) - Colossal Monster
*** All of the Chaos Additions have big powerful monsters as the DLC centerpieces to their respective DLC. Tzeentch has the Mutalith, Nurgle has the Toad Dragon, and Khorne has the Slaughterbeast. Slaanesh has no comparable creature, and so the Valespawn -- while Lore Compliant -- is mostly invented. It's a creature from the Vale of Creatures, which is a location in the Realm of Chaos, a region of mixed Nurgle and Slaanesh influence.