Well, in 'The Simpsons Simpsons Christmas Stories', there could be a plotline where Homer tries to get the perfect Christmas present for Marge. He might end up getting into all sorts of comical misadventures in the process. Also, the kids - Bart, Lisa, and Maggie - might have their own little Christmas stories at school or with their friends, like Bart's pranks during the Christmas season that backfire in a funny way.
The main characters are of course the Simpson family. There's Homer, the bumbling but loveable father. Marge, the patient and kind mother. Bart, the mischievous son. Lisa, the intelligent and musically - inclined daughter, and Maggie, the cute baby. They are at the center of all the Christmas stories in this special.
The creation of The Simpsons comics involves a group of talented individuals. Different issues might have different creative teams, but typically they include experienced comic writers and artists who are passionate about bringing the Simpsons world to life on the page.
Bart would probably be both scared and curious. He might initially try to play pranks on Slender Man, but as things got scarier, he'd realize he was in over his head. Lisa, on the other hand, would likely try to research Slender Man to find a scientific or logical explanation for his existence.