I'm not generally inclined to make direct recommendations here - links over on the side are as much for my own convenience as to suggest further reading to visitors - but I recently had a video from the YouTube channel Valaverse pop up in my feed, and found it quite fascinating. It seems as though the guy behind the channel is a former Hasbro toy designer who - along the same lines as the folks from Boss Fight Studios - decided to take a big risk and go it alone. Rather than create a wholly unique action figure toyline (and then let it stagnate, its most interesting concepts left unexplored, while churning out licensed products left, right and centre) he purchased the license to 'Action Force' (which is what the smaller GI Joe toys were originally called in the UK, being a spin-off of the larger format 'Action Man') and produce his own characters, costumes and accessories for that.