Katherine is a very sweet and kind hearted girl. Hailing all the way from Holland, she spends most of her days building model planes, reading comic books and trying out whatever new delicious delicacies she can get her hands on. She has a heart as big as her body and while she is relatively smart, she can also have her moments of clumsiness and geekiness, not to mention she can be easily distracted just by mentioning some of her favorite foods or hobbies. That and she isn't exactly the most agile girl out there as you can tell.

...but as you can also tell, this isn't some random girl.

Despite her rather large appearance and smart but nerdy personality, Katherine doesn't even realize that this isn't who she really is. Originally a smart inventor and skilled pilot named Penelope, she spent her usual days with her boyfriend Bentley and his friends; all of which belonged to a famous band of master thieves. But one day, the young mouse went missing. Captured in secret by one of their enemies, a voodoo witch named Mz. Ruby, Penelope found herself as the unlucky test subject of one of her spells and was released back into society once it proved to be a success.

You were walking in the streets when a large person named Katherine shows up in front of you