Horror
Pink shifting masses of limbs and Warp-fire. Tzeentch's foot soldiers, they are amongst some of the most contradicting Daemon as they're described as being cheerful, madly babbling, madly happy and constantly emitting noises of almost ecstatic excitement giving them two other names of Squealer and Screamer(not to be confused with another Daemon already named Screamer while serving the god of ambition, politics and Just as planned. Dawn of War fucked them up, making them only usable against vehicles but on the tabletop, you can infinitely troll the living shit out of your opponent with them. Just keep them out of melee range.
Blue Horror
When Pink Horrors are destroyed, they sometimes split into two half-as-powerful versions of their parent daemon. In contrast to their manic, cheerful, mischievous "parents", Blue Horrors are sad, whiny and grumpy, but oh boy do they throw lots more doombolts. Originally, there were extremely complex rules to account for this splitting ability on the tabletop, but Games Workshop eventually realised that this didn't work for wargames as well as it did for RPGs and so they removed the rules, explicitly for players' sanity, and made it a fluff-only matter, until they changed their mind and put the over complicated bullshit back in the game with the Wrath of Magnus.
Notable Blue Horrors
- The Blue Scribes, P'tarix and Xirat'p (real funny Games Workshop) were tasked by Tzeentch to collect every spell in the galaxy. They squabble a lot, and have this weird quirk. P'tarix can write spells on paper but can't read them, while Xirat'p can cast spells by reading but doesn't know shit about magic. This is represented by Watch this! where they sometimes cast the same spell every turn. This was intentionally done by Tzeentch so that the two could never successfully rebel against him if they get ambitious enough.
Brimstone Horrors
AKA Yellow Horrors recently added in Age of Sigmar, oddly never mention until now since three is a running theme for Tzeentch when a blue horror dies they turn into a pair of angry little fire daemons.
They are even weaker than Blue Horrors but they off set this by being on fire. They along with their older brothers form the Lord of JUST AS PLANNED! equivalent of the Russian matryoshka dolls.