So this one's unusual compared to the two I've uploaded previously. Ishimatsu, as well as pretty much all the other secret non-wrestler characters in Final Fire Pro Wrestling, are basically impossible to replicate in FPG because they use a lot of moves that didn't exist in the latter game.
By the same token, I've had this project where I try to bring some characters exclusive to the Wonderswan version of Fire Pro into FPG as well, with some success. Guy Mezger only ever appeared in the Wonderswan version, but I managed to replicate his full moveset and his logic in FPG. However, there were a number of holes: you can't replicate what he looks like, for the most part, and I have no idea what his stats are. Given these constraints, I decided to play Dr. Frankenstein and 'fuse' the available information of both Mezger and Ishimatsu. The result is what you see in this video.
This hybrid possesses Ishimatsu's exact appearance as in FFP, all of his stats, and fills in the gaps within Mezger's logic that weren't available in FPG. For the rest, he functions as Mezger would, utilizing his full moveset and (admittedly poor) CPU logic. This combination isn't a winning one, but the novelty was worth uploading.