Sid was among the warriors of the holy city who patrolled its roofs alongside Galk. Initially, he came across as brash, arrogant, and short-tempered. However, later, he assisted Clare in her fight against a powerful Yoma, resulting in him breaking his leg. Afterwards, he bid them farewell when they left the city and even gave Clare a kiss on the lips. Unfortunately, Raki kicked him in the crotch during their departure, causing them to engage in a fistfight.
Sid reappeared seven years later and helped Miata and Clarice evade some guards. Unlike his previous self, he did not exhibit any arrogance or rudeness. Later, when Agatha, the former Number 2 awakened as Galatea, Sid became a central figure in the defenders' efforts to take her down. While the guards distracted her, Sid attacked from behind. However, he was caught just before attacking her and she commended him on his skill, offering to have "fun" with him due to his handsomeness. Despite this, she tried to kill him, but Galatea saved him.
Sid used throwing daggers in the initial part of the story and later switched to a short sword when attacking Agatha. Additionally, Raki had visited Rabona one year prior to Clare's arrival, looking for her. Sid commented on Raki's growth during this time.