IX. Benefit
The idea of introducing Kid to a weapon had been percolating around Shinigami's head for a few months now, about the same time that Kid had really taken an interest in learning combat techniques. It was an interesting conundrum: his fastidious, meticulous son was an exceptional fighter, surprisingly so given his slight form and young age. Granted, he was a shinigami being trained by human meisters, but nonetheless the Reaper was not-so-secretly pleased with the progress being reported by his aides.
However as a shinigami, Kid had no actual need of a weapon to battle witches and Kishin eggs. Eventually he would need a Death Scythe of his own, but that was still a long way off. He was already well on his way to becoming fluent in a type of martial arts specific to shinigami: death god martial arts, and drew upon his own soul to form both shields and weapons. If he were to add an actual Weapon to that...
Shinigami admitted that the ability to battle was of a secondary benefit; selfishly, he'd hoped that Kid would continue to stay at home until he was older, but now that he was becoming capable of defending himself it would only be a matter of time before he wanted to hunt down witches by himself. The real reason he wanted Kid to get to know a weapon was for the friendship he hoped it would provide. He was a new parent, but he was no fool: he knew Kid was often lonely in the many hours he spent at home, and though Shinigami didn't worry about the day to day management of Gallows Mansion, he did think that his son needed someone to challenge him. At Shibusen, nearly all of his students formed strong bonds and attachments to their partners and he wanted Kid to be able to participate in that.
Enlisting Spirit's help, however, might have been a poor judgment call.
"This is an excellent idea!" the Death Scythe said eagerly, holding up a picture of a young blond girl with a shy smile. "How about this one? She's a chakram, isn't that nice and refined? Kid needs someone pretty. Bubbly, maybe."
"Kid is only nine," the Reaper said dubiously. "I think he's too young to base who he meets on that kind of... attribute."
"He doesn't act like a nine year old," Spirit pointed out, but gulped at the hard look he got in return. "All I meant was that he's very serious for his age! Very mature! A real respectable boy!" he hastily ad-libbed until the glare was lifted.
He's too serious, Shinigami thought worriedly, once he'd chased Spirit out of the Death Room and taken some time to ponder. But what can I do?