Weapon Upgrade (changes their weapons)
Skill Upgrades (new skills from their current wep)
Personality change (like tsuna becoming ebil!)
I want this manga to restart...
I say downgrade, I really hate tsuna's new gloves they're too bulky
Perhaps more moves that require some tag-team guardians or a un ultra-plot-power move that requires all Tsuna and his guardians to team up?
Would love a Mukuro+Hibari-only move or Tsuna+Yamamato+Gokudera-only move or the whole group.
Would be amazing.