C.J.

"A young genius has invented a ray gun that shrinks anything it touches – including you! But when the scientist and her invention go missing, you'll have to keep the shrink ray from falling into the wrong hands, and find a way to 

CJ is the main protagonist in Shrink Ray Island. She is a genius.

triva
1.The Shrink Ray Gun has a two settings on it, shrink and grow. 2. Other people have said that she won three science fairs.​