If it were to be a sequel to Bionicle, it would be set around 20 years after the end of the original line. I think I'd have a mixed bag of bad guys, including the Barraki, TSO, Makuta from an alternate dimension, Marendar, and some new characters of known species. The heroes would be The heroes from old Bionicle, but perhaps kind of reintroduced. They would be the same characters, but 20 years later, so there would be some changes. It would be set on Spherus Magna, of course, but I think I'd specifically set it on the Aqua Magna side. It would be centered around exploring and settling unknown continents and following in the footsteps of the Great Beings. I'd want to give it that early Bionicle feel of mystery, but with more contemporary characters and technology. Set wise, I'd try the mask pack thing along with the basic lineup of sets. The mainstream lineup of sets would be released similarly to how the 2008 sets were released, with 3 good guys and 3 bad guys per line of medium sets. The story would progress as it did in old Bionicle, with an overall story progression year by year, but a different subplot of sorts each year. If I reached the climax of the overall story and there was still a large following, I'd just create a new goal or bring back an old villain. I'd call it something like Bionicle, Chronicles of Tomorrow or Spherus Magna.