Thor
The fact that Loki was participating in Secret Santa was all that Thor needed to join in. In fact, he was thrilled to see his brother actually interacting with others, even if it was in his moody, Loki way.
The room was innocuous enough, and Thor entered it jubilant and happy, the way he approached almost anything in life.
"Magical table," he called out, "It is I. Thor. I humbly request my allotted gift."