Jack the Ripper

is the captain of the Green Mantis squad of the Magic Knights.

Appearance
Jack is a tall, lean man with gold eyes and loose, medium-length black hair. On the left side of his face, he has a thin, red scar or birthmark running from his forehead down to his chin and passing over his left eye and the left side of his mouth.

Personality
Jack is always grinning and seems to enjoy fighting and cutting things.

He has a habit of running his tongue along his magic blades.

Biography
After defeating a foreign invasion, Jack returns to the Royal City with Julius Nova Chrono and other captains of the Magic Knights. They are welcomed with joy and cheers from the Noble region's citizens.

Several months later, he attends the Magic Knights Entrance Exam and afterwards requests Yuno and passes on Asta to join his squad.

Jack, Nozeru Silva, and Charlotte Roseray save Yami Sukehiro from the combined attack of Liar, Vetto, and Fana. He squares off against Vetto, but when Fana melts Nozeru's Silver Spears, Jack teases him and suggests switching opponents, which Nozeru refuses. Like the others Jack is surprised when Asta makes it through the battlefield unscathed and lands a hit on Licht. When Licht's mana is unleashed, Jack tries to attack Licht but the attack was absorbed. When the third eye seals Licht's mana and leaves, Jack thinks about how strong they are and says that they are worth slicing up.

Sometime later, Jack is waiting in a room within the Magic Knight headquarters with the other captains except for William and Fuegoreon. While waiting Jack talks with Yami and Geldor about the situation with the White Night Eye and about the stars that they all receive. When Lil Bowamoltie tries to defuse the situation with an impression of Fuegoreon, Jack gets angry and tells him to not get carried away just because Lil is the youngest captain in history. When William arrives and they are all called to the dungeon, Jack head their with the other captains. Once they reach the dungeon and finds out that Geldor is the traitor among them, Jack says that he knew that Geldor had his hands in some dirty stuff. When Geldor runs, Jack activates his magic but is disappointed when Geldor is captured before he could attack. Jack then watches along with everyone else when they look into Geldor's mind and find everything that he had done. Jack then listens as Julius tells them to keep what they have found out a secret and then leaves along with some of the other captains.

Magic

 * Slash Magic: Jack uses a form of magic to generate blades which are said to cut anything.

Abilities

 * Immense Magic Power: As a captain of a Magic Knights squad, Jack possesses an extremely large amount of Magic Power.
 * Immense Strength: Despite his skinny frame, Jack is extremely strong as he easily slices the ground apart when he attacks Vetto and is said to be able to cut through anything, even mountains.

Equipment

 * Grimoire: Jack possesses a grimoire, which contains slash-based spells that he could use during combat. Jack's grimoire is very plain and simple in design, lacking any ornaments.

Fights

 * Jack, Nozeru, and Charlotte vs. Liar, Vetto, and Fana
 * Asta, Julius, and the Captains vs. Geldor Boinzott

Trivia

 * Jack the Ripper, after whom the character is named, was the popular name for an infamous but unidentified London serial killer.