Aekold Helbrass
Aekold Helbrass was a Chaos Champion of Tzeentch introduced in the 4th edition of Warhammer Fantasy, and was then promptly forgotten (at least until The End Times).
What separated him from other champions and lords of Tzeentch, was that he wasn't a wizard, and his special ability given to him by Tzeentch: the Breath of Life. See, wherever Aekold wandered, he would make the land spring into life, as grass and flowers would grow around the area he walked. This ability also allowed him to heal those in the threshold of death (presumably annoying Nurgle greatly), and make wooden objects start taking root again.
He fell during the End Times, dying in battle against Felix Jaeger.