Suits of Armor are actually rare enemies that appear in this game only appearing in one hallway. There is a Suit of Armor that actually uses a mace to attack Luigi with.
Suits of Armor play a much larger role in this game. Suits of Armor appear in the mansions Gloomy Manor and the Treacherous Mansion. In Gloomy Manor, Suits of Armor are mainly seen in the Guard Hall where they all attempt to damage Luigi with their swords. There are also two Suits of Armor in the Entrance but they are not alive. In the Treacherous Mansion, in some rooms, Greenies will sometimes take over a Suit of Armor and try to damage him. The Tough Possessor takes over a body of a large Suit of Armor and even has others to aid him in the boss fight.