So. A few weeks ago, I wanted to remove Kin's powers (aka her PSI) and change her relations to canon characters.
Although she has no "unique" powers, she has a new partner that lives in her shadow.
Many years ago, a writer was requested by the King and Queen of Peraidine to create a story for their spoiled children. After months of work, the old writer completed his piece and presented it to the King and Queen. Unfortunately the children were unsatisfied with the story and destroyed his latest work. His reputation was soon tarnished. Filled with anger and vengeance, the old writer created a new storybook that he cursed to make a character, named Nightmare, come to life and put the reader into a nightmare-fueled coma. The writer wanted a chance to deliver the royal family a book one last time before he moves on. Successfully, the curse has inflicted the royal family, except one. A young royal mage fought against the horrible creature and sealed the book away in the deep depths of the castle.
Back to the current timeline, Kin the Hedgehog explores her castle home and discovers a secret behind a large library bookshelf. Finding the old book and reading, Nightmare appears and curses Kin. Nightmare tosses horrible memories and her worst fears towards the young hedgehog girl. Later defeated by Kin, he uses his last resort to possess her body; however he screwed up and landed on her own shadow with no escape from it. Forever stuck as her shadow, Kin uses him as a powerful, controllable ally. His weakness was light. If Kin dies, he dies as well.