This isn't exactly my best one, but I did say I wanted to do something for Halloween.
I wasn't sure what to draw, so I picked Projeline, a cosmic doppelganger of Thunder with a zipper on her chest and an obvious parody of those "EXE games" everyone is crazy about these days. I actually created her back in 2016 when the EXE fad was in, particularly as a joke character, but redesigned her along with the real Thunder recently, and I'll probably use her more often. I even made her my background banner for the Clip Studio Asset Store. :P
The artwork in the background is actually my own art featuring Thunder's really really old design, but heavily vandalized to appear more disturbing. She used to have a more humanoid face before her species was redesigned and the concept was recycled for the Okami species instead.