Connections (Yes, there are)
Both are charismatic and well-dressed villains that use trickery to get their way and are the main villains of childrens' series
Both pose as seemingly innocent beings (Slappy acts as a normal ventriloquist dummy and Bill acts friendly)
Both are the archenemies of brilliant writers (Bill has Stanford and Slappy has R.L. Stine, only in the film series)
Both are egocentric and have their own team (Bill has The Henchmaniacs and Slappy has the rest of R.L. Stine's monsters)
Both are seemingly unkillable (Bill came back from death and Slappy can come back as a ghost and resurrect himself)
Battle Name: The Puppet Show
Composite Slappy will be used, including his incarnations from the books, movies, TV series, and comics)
Slappy has access to all of his powers and forms, just to give him a chance
