So I found 3 early scripts of Hotel Transylvania 2 a while ago and each one has a lot of ideas that didn't make into the final film, like Vlad not being in one of the scripts, Mavis and Johnny going to Paris instead of Santa Cruz, etc. One of the scripts also includes a cut character named Carter Quinston, who was going to be the main antagonist of the film before he was replaced by Bela.
https://wikileaks.org/sony/docs/03_03/Mktrsch/Market%20Research/Scripts/HT2_2nd_draft%20%283%29.pdf (September 20, 2013 draft)
NOTE: It's weird that Quasimodo Wilson from the first film was going to be in it as well as Harry Three-Eye appearing more than one scene. Also, the names of Johnny's brothers' names were revealed in the scripts as Brett and Kent.