So basically, Spritfan got the idea one day to make a huge world that involved combing stuff from a bunch of Baldi related content, including Mods, Fangames, Roblox Fangames, etc. into one huge world, and Spritfan soon told that idea to Baldi, and they worked together to build the Super-School-World and the other things seen in the game. They also hired the other devs later on to help them build the Super-School-World and stuff.

However, NULL one day caught wind of this and became aware about what Spritfan and Baldi were doing, so he decided to hyponotise/possess True Spritfan and make him his Assistant/Puppet.

With True Spritfan under NULL's control, NULL made it so that True Spritfan can spawn at random times in a mode, making him wander around the School and also make it so that if he touches a player, he teleports them to a jail cell where he is also there, in which a soldier will be there and will shoot both the player and True Spritfan, killing both of them. (True Spritfan has respawning abilities, meaning that when he dies, he just goes back into the game's files/code and can reappear again)

In NULL Mode (which I will try my best to see if I can make for BURW, which I likely can), True Spritfan will also appear there as well and will try to help NULL, in which True Spritfan will appear at random times during gameplay chasing the player at a very slow speed, but when touched, catches you and causes a gameover. When you get to the final battle, True Spritfan despawns and the normal NULL bossfight happens.

When NULL is defeated, True Spritfan is free from NULL's control and from there will spawn as a normal character that just freely wanders around the schoolhouse.

(I might come up with some more lore stuff later but this is what I have for now, feel free to tell me some suggestions for the lore if you wanna.)

Anyways ya, that's basically all I have for now to explain for the lore, so ya.