The "Weapon Collection" is the unofficial name given to the group of characters that either have "Weapon" in their names or are related to them or their stories in some way.
These characters include the following:
HV (Connected to UXW somehow)
Dino-Weapon (Kid-friendly dinosaur version of Robo-Weapon)
Robo-Weapon (UXW's main enemy, possibly related to UXW in a past life)
UXW (Main Weapon variant, Robo-Weapon's main enemy, nearly immortal and one of the most powerful fictional characters)
Glue UXW (Gluniverse version of UXW, one of the more powerful Glue Creatures)
Wrangle (Connected to Dino-Weapon)