The White Dragon (はくりゅう Hakuryū) is an enemy-only Dragon class that is exclusive to Fire Emblem Gaidenand it's remake. Throughout the course of Gaiden, only two of these creatures appear as hostile units, specifically in the Final Chapter. While White Dragons are somewhat hard to kill, they do not present much of a challenge overall due to not being particularly common enemies.
In Gaiden, White Dragons appear to be in a decayed state similar to Draco Zombies. This is different in the remake, where their portraits depict them as being in the peak of life. Oddly enough, their battle models in the remake are faithful to their original incarnation, where they assume the appearance of recoloured Necrodragons.