Kurt Wagner and Marco
Of course Marco knew who he was. After all, he didn't even flinch when Kurt had teleported right in front of him. That must have meant that Marco had grown accustomed to Kurt's teleportation abilities. It was strange to Kurt, the amount of people who knew who he was here. The amount of people that Kurt didn't know, but who knew him.
He shook his head at Marco's question, "No, I'm sorry. I know I've been here before. Star, Terezi, Jean have all told me. So has Raven. But... I can't remember a thing."