Whistle is a rather mysterious individual with a quiet and withdrawn personality. Very soft-spoken, she speaks only when the situation calls for it and, true to her name, in a very low volume, rarely uttering more than a few words at a time. Heroic, optimistic, and just as fearless as Sonic the Hedgehog, Whistle is scrappy and loves to tangle with bad guys. Not intimidated by danger in the slightest, she has a thirst for adventure and excitement and craves new challenges for herself.