Dion is a new character 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.
During a meeting in the past, when the Professor failed to show up at a meeting, Dion asked Abigail if he should forcefully bring him due to his constant absences. Abigail tells him not to, though she states that it would be nice if he could send someone in his place.
Dion later "allows" Caroline to escape with the Sky Jupiter Queen and causes a panic at the prison, especially with Izabella who had started to take a liking to Caroline. Dion does not state why he allowed her to escape, though it is presumed that he was trying to find the Ptolemaic base.
- He bears a resemblance to Raidou Kuzunoha the XIV from the Devil Summoner series.
- He is the second male character to wear sunglasses since Tarma Roving.
- Like the Aikawa sisters, Hyakutaro Ichimonji, and Sisilia, he runs away upon being defeated.