The mascot of Newgrounds, Sergeant John Captain, or rather Tankman, is the benevolent leader of a military faction named the Tankmen.

Although he is the leader of the Tankmen, Captain has a black soldiers' suit, with black gloves and boots, and a white bulletproof vest. He has two corporal insignias on both shoulders, making him the only Tankman to have these, possibly to show his rank. He has a helmet with a white visor, leaving his mouth visible.