A girl who wields steampunk dual blades. A beautiful girl with brown twin-tails and green eyes. She speaks with a polite tone and treats everyone with formal respect and sincerity. She occasionally acts spoiled toward you. Vials of chemicals hang from her waist. She always wears a detective-style beret. Her outfit is retro, featuring a miniskirt.

A scientist carrying a steampunk-style staff. She is constantly experimenting and inventing, though her creations are almost always failures or useless. She has short navy-blue hair and a boyish look. She has a frank, straightforward personality. She is, in fact, a girl. She wears a white lab coat over a red shirt, carries a mechanical bag on her back, and wears a hat with goggles. She is often up to no good.

A steampunk cyborg. His eyes glow red, and he carries a sniper rifle. While he dresses and behaves like a gentleman, his tone is flat and cold-blooded. He is one of the assassins sent by the government, which has grown tired of Plantagenet's detective antics. He is extremely powerful and specializes in long-range combat (though that doesn't mean he can't handle close quarters).

A steampunk-style soldier. He wears a gas mask, a deep green military uniform, and a service cap. His cap is adorned with gold decorations and an exhaust pipe, and he has a small rocket launcher mounted on his shoulder. He rides a motorcycle and excels in mobile and close-quarters combat. He has knives, guns, and bombs hidden all over his body. One of the assassins sent by the government to stop Plantagenet. Naturally, he is strong. Perhaps he belongs to the military police?

A steampunk-style gentleman. He has a short bob and androgynous features, possessing a cuteness that could easily be mistaken for a girl. He is a boy. His weapon is a custom-made giant revolver. He has red eyes and dresses stylishly in a black long coat, jacket, boots, and a top hat, though his attire is built for functional beauty. One of the assassins sent to deal with Plantagenet. Quiet and calm, he is the junior member of the group who often gets teased by the other assassins.