NULL is a helperbot operated by a hivemind. It uses pronouns such as we/us/our on itself, and uses it/he individually. It speaks in a way that confuses other NPCs, often talking about something called the "prime" and the figure Icarus.

He is planning something that is a mystery to most of the NPCs, save Folly and MR. NULL is deadset on carrying out this plan and sees everything else outside of it as trivial, and sees others who don't use their full potential like he does to be wasteful. He very openly dislikes and judges those who don't meet up to his expectations, especially if he knows they can do more with themselves.

NULL has the power of using Roblox Studio tools, particularly the move tool and the ability to anchor, create, and remove objects. The exstential nature of these powers greatly confuses other NPCs, and they often misunderstand them for NULL being psychic.

NULL primarily uses its Studio powers in game to create balloons, which can then be popped and give the player a random effect. These different effects include fafa, Orbs, Rain Boots, Rat Poison, Red Block, Slowness, and Tomato Torment.

As gifts, NULL will accept the Cheezburger, Fizz Up!, Cheese, Medkit, Fizz Jug, Jerm Pop, Red Block!, Infinite Ice Cream, Dance Potion, Chocolate Milk, Gas Mask, and Cake Slice. He will not accept the Magic Mirror, Wet Cement, Kitty, or the Cooler.