After beating the last boss, if the hundreds number in your highest score is one of the following denominations, a different character will appear at the start of the credits. *Note: this will only appear by beating the game in Round/Loop 2 or above.

Unlockable	How to Unlock
Girl on a Bird	Hundred Score Is 500
Goemon Impact	Hundred Score Is 000 or 800
Gwin Bee	Hundred Score Is 700
Potted Plant	Hundred Score Is 100 or 900
Red Rocket	Hundred Score Is 300
Santa and a Reindeer	Hundred Score Is 200
UFO	Hundred Score Is 600
Zebra on a Rocket	Hundred Score Is 400