Not exactly the most original thing out there, but here's my attempt at making a counterpart line for BeelStarmon. I've always preferred Wizarmon and Baalmon for Impmon's Adult and Perfect stages, as I just feel that they fit better then stuff like SkullMeramon imo, even if Baalmon was made for Beelzebumon (2010) specifically. Was going to use Witchmon as that parallel to Wizarmon going into it, so I kinda just built from there. Ghostmon is pretty obvious Child Form for the two, and it works well with the general aesthetic of Witchmon. Mokumon and PetiMeramon were chosen largely after seeing the Artwork of them from the Union Impact card, as they were drawn trying to be all spooky there, so I figured the mini-fireball worked well into the Will-O-Wisp theme Ghostmon has going on. Couldn't really find a better Female Demon counterpart to Baalmon for the Perfect Slot other then LadyDevimon, so she's here simply because it's a functional stage and works well as a stepping stone into BaalStarmon's darker colors from Witchmon. Finally, it was kinda bugging me for the longest time that BaalStarmon doesn't have a proper equivalent to Blast Mode, but Adventure Colon introducing mode changes that borrow design elements from their X-Antibody counterparts such as Alteros Mode came at a convenient time, so BeelStar X is pretty much there for a similar type of Mode Change as a Blast Mode counterpart since it's close enough to what I'm looking for.
Probably spent way too much time elaborating on an otherwise very obvious and straightforward line tbh, so I'm sorry for dragging this post out this long.