Kotomi Is My Hero: Belphegor is insane. Therefore, he is luff. heart
Tsubasa_no_kaito: Ahaha, that will be muchly awesome. ;3 You'll have to post pictures!
And yes, I think we're all waiting to hear the deep dark secret of the Arcobaleno.
Marche 511: I have no idea where the system originated, but the numbers are a coding system for the characters. Each character is assigned a number based on the similarity of the syllables of their names to the Japanese primary and secondary numbering system.
Ichi - 1
Ni - 2
San - 3
Yon - 4
Go - 5
Roku - 6
Nana - 7
Hachi - 8
Ku - 9
Juu - 10
So Goku(dera) gets 59 from go and ku, Tsuna is 27 ( 'tsu' = closest to the English two, failing any resemblance to a Japanese number, and 'na' from nana, seven). If there's no resemblance to any number English or Japanese, they get a letter, like, Dino is D and Reborn is R.
Yes, it's bizarre, I know. sweatdrop
And Yama's denseness is kinda...EPIC. XD