|Favorite Thing to Do||Juggle|
|Voice Actor||Jelani Imani|
Harry Fay is Peter's eight-year-old twin brother.
Harry is a very restless little boy guppy. His favorite things to do are juggle, play sports, and admire his tail. He can be quite full of himself when given the opportunity - for instance, whenever he races against his friends, he always prematurely declares himself the winner. Rhys is his best friend, and his favourite colour is yellow.
Harry looks just like Peter, but his eyes are blue instead of green.
- So far, Harry has only appeared in five episodes.