Alex Katsopolis

Alex Katsopolis is one of the main characters of the long-running sitcom Full House and its spinoff Fuller House. He is the the son of Jesse and Rebecca, and the twin brother of Nicky Katsopolis. He (along with Nicky) are born in season 5 when Michelle starts turning five years old. He and is brother are a fun-loving and humorous kids, but Alex is outspoken while Nicky is quiet. His favorite story book is "Three Billy Goats Gruff", and his favorite color is red. He and his brother can cause trouble in a good way and they often repeat on what other says.

He is named after Becky's teacher who inspired her to journalism.

He is portrayed by Kevin Renteria in season 5, and portrayed by Dylan Tuomy-Wilhoit in seasons 6 to 8.