Charys Yserian is a level 50 reagent vendor located in the Mage Quarter in the human capital city of Stormwind City. Her store is called Ancient Curios and she is regularly visited by Stormwind resident, Karlee Chaddis and her children, Paige Chaddis and Gil. When they arrive, the children go through a dialog, explaining that the rabbit named Fizzles sitting on the counter next to Charys was actually a 'great' wizard.
She occasionally sell uncommon items as well:
No definitive source has indicated that Charys Yserian is a green dragon. However, the name "Yserian" seems to be an obvious reference to Ysera, and that Charys is garbed in green robes have led many fans to believe she has, at the very least, some connection to the green dragons. Nevertheless, this remains an educated guess. Could possibly be a dragonsworn.