SPOILERS FOR RECENT MANGA CHAPTERS AND ANIME EPISODES!
(left to right: Alaudi, Knuckle, G, Asari Ugetsu, Lampo, Daemon Spade)
(center: Vongola Primo (Giotto) )
Recently introduced in the manga are the people who originally owned the Vongola rings, under the first Vongola boss (Vongola Primo).
An anime filler season (April 3 to June 12, 2010) covered these people in more detail. The episodes are summarized at Racconti di Arcobaleno.
Sky – Giotto
first Vongola boss
principal weapon – gloves
Storm – G
close friend to Giotto
principal weapon – crossbow
Rain – ASARI Ugetsu
Japanese musician and swordsman, friend of Giotto
principal weapon – one long sword and three short swords
Cloud – Alaudi (Alaude)
policeman/detective, maintains law and order at borders of Vongola holdings
founder of CEDEF (the external advisory group Basil is a part of)
(Italian for ‘skylark’)
principal weapon – handcuffs
Mist – Demon (Daemon) Spade
(‘spade’ is Italian for ‘sword’)
principal weapon – monocle lens
Thunder – Lampo
cowardly young member of ally family
(Italian for ‘lightning’)
principal weapon – shield
Sun – Knuckle
boxer turned priest
principal weapon – fists
Nearly all of them look like their tenth-generation equivalents. Or rather, the family under Tsuna, Vongola Decimo, looks a whole lot like these people.
My thanks to the members of the hitman_reborn community for the clarifications.