This hack changes Gantz's name back to Guntz. It's unknown why his name was changed for the North American release, though some speculate it was to censor any reference to the word "gun", allowing the game to keep its E rating.
The 0xED hex editor was used to make this hack.
Klonoa 2 - Dream Champ Tournament (USA).gba
SHA-1: 35C05676E65FD4C92220861662CD3709342F36E2
CRC32: 8BD23A7F