An enemy is a major entity in Mari0 that the player interacts with. Unlike an entity, enemies are fully customizable; you can create your own custom enemies using premade properties and an image file. In Mari0: Special Edition, enemies and entities have different tabs, and are considered separate, and more enemies can now be placed in addition to their previous way of spawning. The Poison Mushroom was also added.
Enemies can be placed in the editor; they are found under "Tiles > Enemies." To place one, select it and place it as you would a tile or an entity. Each enemy acts differently, but are generally not tied to anything game-changing. for more information, please refer to that enemy's wiki page. To erase an enemy, select the eraser entity and place it on the enemy you wish to erase.