The bank guard is a man employed by the Draynor Village bank after the Wise Old Man's violent robbery. Players can talk to him to watch a video of the robbery for 50 coins.
There is also a guard in the tree next to the bank. When you have stew in your inventory, he will say, "Is that stew for me?", and if the player's answer is affirmative, he will pay them 30 coins for it. If a player tries to chop down the oak to his right the guard will yell at them, "Watch what you're doing with that hatchet you nit!" or a multitude of other responses.