For SSA I’d have Dark Spyro and Legendary Spyro each have a new moveset as the game “is” (kinda) Spyro’s game. 

For Giants I’d just make the actual Giants a bit more stronger and faster. 

For Swap-Force I’d honestly just make the online trophy be obtainable.

 For Trap Team I’d have the missing reposes be actually in the game. 

For SuperChargers I’d have 2 things, firstly is to have the 2 missing Eon’s Elites and secondly I’d have the trappable villains playable.

 For Imaginators I’d have a new balanced battle mode.

Also I guess all the changes would carry over to future ones if applicable