Arms Dealers From Hogwarts

"In battle or war, any ability or tool, be it magic, ninjutsu, or even the devil fruit, is considered munitions. If it's munitions, you can purchase it from me," proclaimed Jemini.
"Ron! These things are way more straightforward than a magic wand!" exclaimed Harry, wielding two guns.
"Jemini, where's that alchemy cannon of yours? Bring it out for me!" demanded Hermione, known as the steel maiden.
"Captain Seamus is ready for action!" shouted the explosive enthusiast, Seamus.
In 1991, Jemini arrived at Hogwarts with his armory store.
He wasn't just a businessman; he was a diligent one.