Characters in Krustyland

x KeNnY x M x

List of Springfield Residents who visit Krustyland
List by Chris and unlock info from simpsons wiki

Krusty - Immediate
Homer - Immediate
Cletus - Unlocked at the beginning of Krusty-est Place on Earth Part 6
Sideshow Mel - Unlocked at the beginning of Krusty-est Place on Earth Part 6
Bart - Unlocked at the end of Krusty-est Place on Earth Part 6
Lisa - Unlocked at the end of Krusty-est Place on Earth Part 6
Kearny - Unlocked at the end of Krusty-est Place on Earth Part 6
Milhouse - Unlocked at the beginning of Krusty-est Place on Earth Part 8
Martin - Unlocked during Krusty-est Place on Earth Part 12
Skinner - Unlocked during Krusty-est Place on Earth Part 12
Otto - Unlocked during Krusty-est Place on Earth Part 12
Comic Book Guy - Unlocked at the end of Krusty-est Place on Earth Part 15
Chief Wiggum - Unlocked at the end of Krusty-est Place on Earth Part 18
Hans Moleman - Unlocked at the end of Krusty-est Place on Earth Part 18
Squeaky-Voice Teen - Unlocked at the end of Krusty-est Place on Earth Part 18
Nelson - Unlocked at the end of Krusty-est Place on Earth Part 25
Lenny - Unlocked at the end of Krusty-est Place on Earth Part 32
Carl - Unlocked at the end of Krusty-est Place on Earth Part 32

This is from Sahl's guide stickied at the top of the forum.