Hmm not even sure if this will be taking off now xD
I sort of had to vanish (and am still vanished) since I've got an assignment that's due Sunday that I'd barely touched. Haven't received any CS's yet. Though that might be because I went poof xD
I don't mind you using Arthur, though I should clarify that Excalibur (or whatever sword) doesn't have any powers. Not until you get your second magatama which will be a fair way into the RP at least anyway. 
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@AoStar
Sorry about the lack of response, I'll reply now.

A magatama can basically be anything. There is no list to choose from. I do prefer people to use mythical/historical figures, but you can go with something more broad like a Goblin, Yeti, Vampire etc and take traits from that. if you want to customize your own mythical figure.... I'm open to discussion, but it probably won't work.

None of your characters have ingested Magatama at the beginning of the RP. That'll happen in the first few visits to Rebirth. At the start of the RP your character would just be a typical student with no special powers, that's suddenly been thrown into a strange world.

A traditional weapon can be anything. An axe, sword, chair, dynamite, bottle of ketchup, or a pen. 
A traditional weapon can be anything, and can be used as a weapon (stab) or it's traditional use (writing on paper). It however won't have any abilities out it's original use. Also keep in mind that a sword is a lot more efficient as a weapon than a pen. Your pen can break, and if it breaks it disappears and can't be summoned again for a set period of time. (Resummoned pen is fixed, not broken).

It depends on the weapon of choice, but I would not classify a chainsaw as a sword. 
The ability to summon the 'object' is a trait a character receives once they've ingested a magatama. As such, none of the characters will have their weapon initially. 
The objects can be summoned out of thin air, and be unsummoned as well.