In any mode, collect Coins found scattered about the Tracks to unlock more karts, bikes, wheels and gliders. Unlockable Vehicles and Parts in Mario Kart 8 Deluxe Characters are unlocked randomly as you get Gold awards.
You unlock characters by getting Gold in Grand Prix mode. There are at least 14 unlockable characters in Mario Kart 8 Deluxe. Unlockable Characters in Mario Kart 8 Deluxe
