Alphonse is a supporting character who appears in one of the early adventures featuring Lina Inverse and Naga the Serpent. He is a sorcerer with a notable and unusual personality, defined by his tendencies as a peeping tom and his masochistic nature. These traits drive his actions throughout his role in the story.

In terms of background, little is revealed about his past, but his behavior establishes him as a peculiar and morally questionable individual. His primary motivation is not driven by revenge, grudges, or any grand scheme. Instead, he develops a twisted fondness for Sirene, the rich man's daughter whom Lina is hired to protect, after she kicks him several times when he is caught peeping at her and Lina while they are bathing. This violent response from Sirene is what sparks his interest, and he subsequently kidnaps her simply because he has taken a liking to her.

His role in the narrative is that of an antagonist for the episode. After Lina stages a fake kidnapping to teach Sirene a lesson about her reckless spending, Sirene is then genuinely abducted by Alphonse. This forces Lina to team up with Naga to rescue the girl. Alphonse’s key relationships are primarily with his victim, Sirene, and with Lina Inverse, who confronts him as an obstacle to be defeated. His dynamic with Sirene is central to his motivation, as he is attracted to her aggressive treatment of him.

Regarding his development, Alphonse shows no significant change or growth. He remains a quirky, one-off villain whose personality is established purely to create a comedic and bizarre obstacle for the heroines. His notable ability is his use of sorcery, which makes him a credible threat despite his eccentric and perverse nature.