Carlos Ruiz (born May 9, 1997) is a Spanish professional wrestler known under his ringname A-Kid currently signed to WWE, where he performs on the NXT UK brand and was the inaugural NXT UK Heritage Cup Champion. He has previously competed on the American and European independent circuits, notably for Pro Wrestling Guerrilla (PWG), Progress Wrestling, Chikara, Defiant Wrestling and White Wolf Wrestling (Triple W). In April 2018, he became the first Spaniard and, at the age of 20, the youngest wrestler to ever compete in a singles match rated five stars by the Wrestling Observer Newsletter.