Reza is a student at Dragon Hall and a son of a former Royal Astronomer of Agrabah. He is known to be Carlos' rival and uses very long words. In the book Isle of the Lost, he had stolen a vial from the lab (an ingredient for an antidote). Luckily, Jay had stolen it so Carlos is able to make the antidote. He also interrupts, as shown in the books.
"Why does he always have to call on Carlos"