In Mark's Gospel, there was a young man in the empty tomb, with no suggestion that he was an angel.
In Matthew's Gospel, as the women approached, an earthquake moved the stone and an angel came down and sat upon the stone. The story does not say who the angel was.
In Luke's Gospel, the stone was already moved and there were two men, apparently angels inside the empty tomb. The story does not say who the angels were.
In John's Gospel, the stone was moved, but when the disciple whom Jesus loved looked in, he did not see an angel, nor did Peter when he actually went into the tomb. Some time later, Mary looked into the tomb and saw two angels inside. The story does not say who the angels were.