That is actually a character called Doorman. The group is basically a version of the Legion of Substitute Heroes Marvel style. They had been the Great Lakes Avengers but had to switch their name because the Avengers threatened to sue them.

I fondly remember that Plastic Man team up and yes he was dressed up as Santa. At that time in his history he had a tough time finding work because of his criminal history. The letter column back than for the Brave and the Bold received letters about a wealthy Batman/Bruce Wayne flipping a couple of coins at Plas and wishing him a merry Christmas. It didn't bother me at the time because I just figured Plas with his powers would find something.

Fair play!