From the Super Mario Wiki
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Sunbi is a Nimbi from Super Paper Mario. His name is derived from Sunday, just like many other Nimbis that have month and season derived names. He gives the heroes a Door Key after the player defeats two Skellobits that ambushed him.
That's Sunbi... He's a very serious Nimbi... He volunteers as a palace guard in The Overthere... Though not physically strong, he has a strong sense of justice...