Dion is a new unit introduced in Metal Slug Attack, making his debut in the Extra Ops "Hot Trap".
Originally one of Abigail's spies, he was promoted to Lieutenant after she was impressed with his combat capabilities. He serves as her right-hand man and is a skilled fencer, using an elegant rapier to attack his enemies. He also carries a pistol for ranged combat. Much of his personal information is secret, as Abigail doesn't even know his actual name.
- He bears a resemblance to Light Yagami from Death Note, Rudol von Stroheim from JoJo's Bizarre Adventure, Brocken Jr. from Kinnikuman, Colonel from Mega Man X4, and Raidou Kuzunoha the XIV from Devil Summoner series.
- He is the second male character to wear sunglasses since Tarma Roving.
- Dion, alongside Professor, Red Goblin, Owen, Pharaoh, Licht, Vatn, El Dorado, Fedeln Metzelei, Gemini Twins, and Sho are the only new male characters introduced in Metal Slug Attack to date.
- Like the Aikawa sisters and Sisilia, he runs away upon being defeated.