Simon is a youthful individual who is sometimes mistaken for a girl because of his relatively small stature and straight long hair.
Simon wears a set of full body armor which makes him look more like a samurai than a knight.
Simon is a calm man, and very patient if necessary, as shown as when he waited for his "prey" to attack. Simon is probably competitive, as he dislikes the idea of someone else killing his intended "prey".
Not much is known of Simon's history but at some point of time, he joined the newly-formed Dawn Roar after the Seven Deadly Sins split up 10 years ago.
Simon and Dawn Roar are ordered by Helbram to travel to Ordan where a local knight spotted the Armor Giant in the forest. Dawn Roar bring along a group of knights, which are beaten and killed by the Armor Giant. They identify the Armor Giant as the Seven Deadly Sins member Gowther. Simon asks Hugo if he knows Gowther, and Hugo responds that he has seen him on the wanted posters before. Slader orders the group to make a stand-off against "Gowther" and attack when he makes a move. Slader and the rest wait for half an hour until Pelliot comes to them (which annoyed Simon) and, thinking that he is a dangerous criminal, attacks "Gowther."
"Gowther" is about to smash Pelliot but Armando pushes Pelliot out of harm's way, sacrificing himself. Slader and the rest know that now is the time to attack and jump "Gowther." As the battle begins, King petrifies Hugo with his Chastiefol Form Three: Fossilization. Simon saves Hugo by cutting his arm off, stopping the petrification, at his teammate's request. Simon heads toward Meliodas to stop him from saving "Gowther." When the air clears up, Simon is surprised that Meliodas is the captain of the Deadly Sins, due to his height and appearance. Simon is later upset when Slader accepts Gowther's offer to take the head of the Armor Giant. He had wanted to take Gowther's head but Slader tells him to stand down.
Entering the king's bedchambers, Simon and the other Dawn Roar members witness Slader's valiant attempts to save the royal family, but Vivian's Perfect Cube spell impedes him. Baltra orders Dawn Roar to stop Slader, and they comply. Despite all this Slader refuses to leave Baltra, even with the rest of Dawn Roar pulling him away.
When the Seven Deadly Sins and Dreyfus' group suddenly appear out of nowhere via Merlin's teleportation, Simon and his teammates become alarmed and ready their weapons. Simon reprimands Gowther for laughing at Slader's inability to break Vivian's Perfect Cube, even though Slader tells Gowther to laugh at this. After Baltra is freed, Simon and Hugo obey the king's orders to treat Slader's wounds and witness Dreyfus' confession of murdering Zaratras 10 years ago. Later, Simon supervises Dreyfus' arrest and expresses shock when he sees King Baltra cough up blood. Suddenly the castle is destroyed by Hendrickson, nearly killing everyone inside, but Simon is saved by Chastiefol's Form Two, Guardian. Simon later appears in front of Merlin's old castle as he is ready to face Hendrickson with the Deadly Sins. When Hendrickson appears with a new form and starts killing some Holy Knights, Simon steps in and uses Stance Sword "Ring" to slice around Hendrickson. This sends Hendrickson flying towards several other Holy Knights as they combine their powers to try to defeat him, but this ultimately proves to be no use.
As a member of the Dawn Roar, Simon is shown to be a powerful and skilled Holy Knight, being able to harm the Armor Giant in swift and deadly attacks.
- Stance Sword "Ring"「構え太刀 "円" Kamae Tachi "En"」: Simon performs an upward slash with his sword, creating a circle of wind around him that cuts at his opponent.
Simon wields an unusually long katana.
Simon works well with his teammates.
Armor Giant arc
- Dawn Roar vs. Armor Giant: Indecisive
- His attack is a reference to Kamaitachi, a mythical Japanese weasel associated with cutting whirlwinds.