Yuuko is an eccentric, sarcastic, bossy, mysterious, philosopher, old and wise witch. She makes wishes come true, in exchange of something precious, but sometimes she can't do anything if the client doesn't cooperate. She owns a shop solely for her wish granting.
It is also said that she is well know in other dimensions, people from other worlds have even gone to her store. She knew and worked in making Mokona Modoki with Clow Read. One of the Most powerful and talented male magicians. Now she enlists a young boy to do her household work not to stop until his work has amounted to what his wish equals.
Yuuko is skilled in granting wishes, dimension transportation, and divination. It's known that she is quite powerful.