I've decided to add Project Arrhythmia to this story because I figured why not put all these great rhythm games together? Here you go:
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Hal:

Lumi:

Aura:

Nautilus:

Medusa:

Siren:

Puffer:

Myst:

Shade:

Jestar Heart:

Kitcat:

Paper Dolls:
(Yes it's Olivia from Paper Mario, but just go with it okay)