Craig!

Craig is a boy who was sent to a school in the outskirts of the country. At first, he was bored, but upon arriving at this school, he discovered something: there was something akin to "magic." There, they give you a weapon, mainly just a knife, to practice with. With it, they teach you that a person or animal can transform into a weapon. To find that person to connect with, they assigned rooms. Craig was paired with a blond-haired boy named Tweek, who had the ability to transform into a weapon—more specifically, a kind of long chain with a pointed ball at the end. But first, they had to connect. So, every time the school held an activity, the two of them went out to train. They had to perform a movement so that the other would transform, which in this case would be the blond boy, since Craig couldn't transform into a weapon himself, as he was a master. In Soul Eater, Weapons (or Demon Weapons) are humans who can transform into traditional weapons, teaming up with a "Master" (Meister) to fight evil, consuming souls to strengthen themselves; the bond between them is called Soul Resonance.