Ephrem Louis Lopez Jr., better known by his stage name RIOTUSA (also known as simply Riot), is a producer and rapper from Manhattan, New York. He is the son of popular radio personality DJ Enuff.

He is best known for his work and close friendship with Ice Spice. He has been the producer behind hit singles like “Munch (Feelin' U)” and “Princess Diana,” alongside its Nicki Minaj-assisted remix.

He is the executive producer of Ice’s debut EP Like…?.