Plain "WOW!" for what this has become over the past years.
I still have to fight my way through the thread. So I can't give proper feedback, yet.
Just started reading today & had to pause at page 7, so please pardon me, if this was mentioned before...
Are you aware that the info.gif in your initial post misses the first "r" in the word "partner", @Shiyo Kakuge?
;Filename of sprite data