Donkey Kong Barrel Blast
Cheat Codes/Hints
Cranky Kong
Race him in Candy`s Requests, level 3, mission 24.
Deluxe Barrel DK
Complete all of Candy's Challenges.
Klump
To unlock Klump, complete the second level of the sixteenth mission.
Unlocking characters
Generally, when you're unlocking characters (by playing a "cup" challenge), you can predict the type of character you will unlock. If you play as a "Kong" character (like Donkey Kong or Diddy Kong), you will unlock a like type character, while if you play as a Kremling (like Kritter or Kip), you will unlock a character similar to them.
Wrinkly Kong
Finish the mission in level 4 challenges where you must help Wrinkly Kong win the race.