Katy spent many minutes thinking on her transformation but nothing could satisfy her pleasure, so she thought why not transforming into something new? A monster invented by her with its own unique abilities, it instantly turned her on and began to type her monster with her qualities.
She called it the "transformation spirit", it was essentially a spirit but Katy modified its abilities. Like a spirit she would have the ability to go through anything and posses people, the addition was that when she's inside someone she would be able to modify the body she's possessing at her own will as she wants, adding or removing parts of the body she wanted, adjusting its size or changing completely its anatomy. Also she added that could posses animals, plants and inanimate objects, for example possessing a wolf and modify its anatomy to shape herself like a werewolf, or possessing a computer and changing herself to an android, the possibilities were endless as she could transform into all the monsters she wanted. For its third ability Katy set that could fuse with more living beings or objects to the thing she's possessing, like possessing a woman and then using her powers in a snake to fuse with her and transform into a naga.
When Katy stopped possessing a body or thing she could decide to leave the person/animal/object in its new form or return to the original one. Also if the body she's possessing is a living being it will have no control and be unconscious unless Katy decides the opposite.
Katy was ready, the world would witness her new power and unleash the chaos in it with her new abilities. She clicked the last button saying "transform" and felt the instant changes, her body was exactly the same but glowing and transparent like a spirit version of herself, she started floating in her room with her new naked ghostly appearance ready to possess something and test her powers.