Dion is a character from Link's Awakening DX and Link's Awakening (Switch). He is one of the two Skeletal Guards who can be found in the first room of the Color Dungeon. He protects the entrance of the dungeon along with his partner Gar. Gar will introduce the place as the Color Dungeon and Dion states that Link won't make it very far unless he has some Magic Powder. Fortunately, Link can speak with Gar to purchase some. After Link talks to them, they will move aside, allowing Link to enter the dungeon.
Gar and Dion in Link's Awakening DX