Just like meta knight and bowser, i believe that other characters need they own victory song, here some examples that i believe will work
Geno: When you got a star piece in Super Mario Rpg
Waluigi: Something from Psycho Waluigi
Weegee: A YTPMV version of the mario victory song with pingas
Shadow: The round clear song from Shadow the Hedgehog
so what you think? any suggestions?