There are two types of Palace Guards.
The first are the patrolling Palace Guards. When they see Mickey, they will make a straight charge for him. Mickey will need to run back or leap out of the way to avoid being struck.
The second are the fruit-slinging Palace Guards. These guards will throw melons either up or down, depending on where Mickey is. The fruit will go straight through any objects it touches. If Mickey reaches their level, they transform into patrolling Palace Guards.