In Mark 16, whom did the women see sitting inside the tomb?

Answer: A young man in a white robe

In Mark the women saw a young man dressed in a white robe sitting on the right side, who told them Jesus had risen.

“When they entered the tomb, they saw a young man dressed in a white robe sitting on the right side, and they were alarmed. But he said to them, “Do not be alarmed. You are looking for Jesus the Nazarene, who was crucified. He has risen! He is not here! See the place where they put Him.”— Mark 16:5-6 (BSB)