With the latest chapter on hitman reborn, all the vongola box weapons have been revealed.

Sky(tsuna)- vongola the 1st cape, ultimate defense!!!
Sun(ryohei)- epic boxing equips, ultimate speed and offense
Thunder(lambo)- the walking robot? defense and recoil damage
Storm(gokudera)- storm bow, damage increases the more you hold it back
Rain(yamamoto)- quadraple sword(might have typo), depends on shigure souen style
Mist(chrome/mukuro)- lens, the revealing of everything =O (or it just illusions?)
Cloud(hibari)- handcuffs, multiplication of handcuffs to bind enemy down

Out of all the 7, the only few i think live up to the guardian's role are ryohei and lambo.