I have a character idea that I never used in my game, but you can be the first one to fully use it. His name is Monkey Dude. It will wait a random amount of time from 10 seconds to 2 minutes, and it will appear in front of the player by swinging down from the ceiling. It will then ask the player that if they want to continue past them, they have to give them a certain colored item. If they do not have the colored item he wants he won't let them pass. But if they do, then he will let them pass, and leave them alone for 2 minutes. This process repeats.
Note the design is only a concept, and if you have a better design idea, you can create it yourself.
https://congo-the-chimp.fandom.com/wiki/File:MonkeyNewVoices.mp3
Also please ignore the first sentence with the people talking background noise.