Mario: Coins and Blocks(These are well placed to make the levels full and less empty)
Crash Bandicoot: Wumpa fruit/peaches and Boxes(These were also well placed to make the levels full and less empty)
Knack:???
Knack has Relics and Sunstones as of right now but they have more of a God Of War approach to them instead of the Crash/Mario type of take
Ratchet & Clank had Bolts and Boxes that helped fill in their worlds also
Knack kinda doesn't have the typical "Wumpa Fruit/Peach" he can collect in levels. He just collects Relics(a unique take that is more of his HP and adds to his overall size) and Sunstones(more of something that fills up his "magic power" meter thingy)
They can probably add that element later on
If you remember correctly, Crystals in Crash Bandicoot were a staple in the franchise but they didn't get introduced until the 2nd game
