After finding and watching a 50+ minute long interview video with Mitsuhiro Yoshida, the director of the Kunio-kun series, I noted the interesting bits of information and made a video about it: https://www.youtube.com/watch?v=FnIaHgBfBRw
Just in case, here's also my older video on Technos Japan which goes through most of the Kunio games https://www.youtube.com/watch?v=0bP81rcV440
Even though they were sort of a two-trick pony(Kunio and Double Dragon)Technos deserves most appreciation, I think.
I love how Renegade has been redone cosmetically for Western release, with different characters and a different 1st level:
https://tcrf.net/Renegade_(Arcade)