Albino Black Dragon, Anduin Wrynn, the Dragon of Stormwind.
Idea based off a fanfic i read awhile ago where Anduin is old and on his death bed, and Wrathion can’t stand him dying, so speaks to several powerful people who can help turn Anduin into a black dragon, so that they can live together. In the fic Anduin looks just like Wrathion as a dragon, but I came up with this idea. Same powers as a black dragon, just different color pallet.