N'Kari

N'Kari is Slaanesh's favoured excess given a name, called Keeper of Secrets in some books and Daemon Prince in others, which is how the Prince of Pleasure prefers its paperwork. As a mortal it earned daemonhood on a world Chaos could not keep. As a daemon it boarded the Vengeful Spirit against the Emperor, and later clung to Fulgrim when Lorgar tried to put a leash on the Phoenician.

It has killed Asurmen and been lanced back to the Warp by Drastanta. It has hunted Eldrad's soul for sport. On ruined Malan'tai it gorged on spirit stones until Grey Knights drained the theft and put it down in the Dome of Crystal Seers.

It changes shape the way other beings change mood: serpent-fat to duelist-lean, always too close. She-Who-Thirsts does not keep boring champions.