Gauche Adlai

is a mage and a member of the Black Bull squad.

Biography
When Asta arrives at the Black Bull headqarters, Gauche is adoring his little sister. Upon seeing Yami Sukehiro's back, he goes to ask him if he can go see his sister.

After Gauche finishes defeating a group of bandits, he shares with them about his little sister's birthday. The notion of visiting his sister brings so much joy to him and causes his nose to bleed. Afterwards, with bags full of toys, he travels to the city where his sister is living. However, to his dismay, he finds Marie plays with Asta.

Gauche immediately confronts his junior, but Asta finds no qualm in his act. Subsequently, Marie also asks her older brother to stop hurting her future husband, which quickly breaks Gauche's heart and body to pieces. The turn of event prompts Gauche to try killing Asta, until Sister Theresia, who is in charge of Marie's well-being, arrives to take Marie back to the church. After a series of arguments between Gauche and the Sister, Marie leaves with the latter as Gauche is unable to stop them. The two Black Bull Knights decide to spend the night at Rebecca's house after she gave them the offer.

At night, while Asta is fast asleep, Gauche enters the young Knight's room and prepares to kill him. Unconsciously, Asta manages to avoid the first attack, which leads to a stalemate where Asta tries to parry all of Gauche's attacks. However, when Gauche creates a clone of himself, Asta is pushed outside where he finds the town is covered with snow. As Gauche is still determined to kill him, Rebecca comes to Asta and informs him that her siblings are missing.

The moment he learns that his sister was also kidnapped, Gauche quits his attempt to kill Asta and confronts Sister Theresia who was supposed to take care of her. Fortunately, Asta manages to prevent Gauche from harming an elderly woman and forces Gauche to calm down by hitting him. After he calmly threatens to kill Asta, Gauche remembers about the mirror that he gave to Marie and could use to trace her location. After convincing Rebecca of her siblings' safety, Asta leaves with Gauche and the elderly Sister. Noelle tries to come with them, but Gauche orders her to stay.

As they reach the cave where the kids are held, they notice a kid outside the cave, but Gauche refuses to stop as his priority is his sister. He leaves Asta and Theresia and goes in alone. When he finds Marie and sees she has a bruise on her cheek, he gets angry and attacks Neige, who tries fighting back using his Snow Magic, but Gauche is too strong for him. When Sally arrives, Gauche tries attacking her, but using her gel magic, she easily dodges and redirects his attacks. When Sally turns Baro into a mud monster, Gauche takes his sister and runs off.

Magic

 * Mirror Magic: A form of magic that allows Gauche to create mirror-based spells using a mirror, like reflecting light or creating mirror copies of something.

Equipment

 * Grimoire: Gauche possesses a grimoire that contains mirror-based spells that he could use during combat.
 * Magic Mirror: Gauche has a magic mirror embedded in his left eye.