From the Super Mario Wiki, the Mario encyclopedia
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Sumbi is a minor Nimbi that appears in Super Paper Mario. She is one of many Nimbis named for a season or month; in her case, Sumbi is named after summer. Bowser unfreezes her by using Fire Breath to melt the ice.
That's Sumbi. A female Nimbi. She's been drawn to men who reek of danger lately. Unfortunately, only boring men are drawn to her.