I like Krag, it sounds very charr to me. I like Corpsemaker too, but it sounds more like a title or nickname (given by the other folks in you warband, perhaps) than an actual name.
My charr is engineer Kronn Hornmelter of the Iron Legion. His adventure started when he was accepted into the Horn warband at young age, where he and his flamethrower soon earned quite a reputation.
Allright, so there WERE some… “unfortunate incidents” before Kronn learned to master the flamethrower kit properly, but most of it could be covered up for by blaming the Flame Legion. However, eventually the “incidents” became so many that his warband leader, Harrk Hornclaw, strongly encouraged Kronn to test out explosives instead of all this fire stuff. After all, he considered it less risky for both Kronn himself and for anyone else in the immediate vicinity.
Poor old Harrk. May his pieces rest in peace.