See also: Character Combat
The squares that a creature occupies on the Battle Map are collectively referred to as it's Fighting Space. Small and Medium creatures (Including most characters) have a Fighting Space of 1 square. Large creatures have a Fighting Space of 4 squares (2 squares on a side). Huge creatures have a Fighting Space of 9 squares (3 squares on a side). Gargantuan and Colossal creatures have much larger Fighting Spaces.