Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Jaden Yuki, known as J dai Y ki in the original Japanese language version, is a fictional character and the main protagonist in the Yu-Gi-Oh! GX anime and manga series. His name is meant to be a pun in Japanese, as "j dai" is the word for "teenager". In the English version, Jaden is voiced by Lucas Gray (credited as Matthew Charles), while KENN (older) and Mariko Nagahama (younger) take the role in the Japanese version.