Gil emerges as a sharp-tongued troublemaker among the temple's apprentice priests, notorious for neglecting duties and frequenting the repentance chamber as one of its most troublesome orphans. Baptized before the orphanage's decline, he remained unaware of the pre-baptism children's hardships until later. The High Priest deliberately assigned him as an attendant to a newly arrived blue shrine maiden, aiming to create difficulties through Gil's disruptive nature.

Initially neglected when his mistress failed to provide basic necessities like food and shelter due to her own unfamiliarity, Gil lacked support or guidance. Yet, after his mistress recognized her oversight and stepped into her role, Gil transformed remarkably. He became cheerful, responsible, and hard-working, driven by a deep desire for praise and a fear of being deemed useless.

Despite his past, Gil possesses a kind heart. He was the first to implore his mistress to aid the suffering orphans, later expressing tearful gratitude when she acted. His personality retains natural childishness and impulsiveness, flourishing with proper opportunities and emotional support.

Motivated by a profound fear of replacement should he become unneeded, Gil extended his duties beyond the temple, becoming the attendant most involved with a workshop and a merchant company, putting extra effort into every task. He perceives a boy named Lutz as a rival, reflecting his competitive yet earnest spirit. Educational gifts like a slate board and a karuta set aided his growth. Physically, he is a child with blonde hair cut to ear length and distinctive purple eyes.