So it's hotel transylvania but way before the first movie I just hope he doesn't prevent mavis from being born because she is my favorite female and character in the whole hotel transylvania animated movie series plus can be part of the harem too.
How about for the next template he gets lapis lazuli from Steven universe as he would control all water on the planet at 100 percent. Or Rachel Roth or Raven from DC for her power over darkness and soul magic. And maybe Ken Kaneki from Tokyo Ghoul for his regeneration and kinke.