Baxstar and Kawaii were intended to appear, but they were de-confirmed and Baxter Ewers will be the only one in the series
Also he's crossovered in another main series with Christian Rice in Christian 2012
The Reason why Baxter Ewers lefted and removed his personal friends from the group was because of the fact Desi has more fun with Marionette and they're buddies more than Baxter thus leaving him out and actually leaving the group.
He also stated that Desi is not his #1 Best friend, he said that Christian Rice or Nicknamed "CD Rice" is his true best friend.