The site has been down for ages though, and trying to retrieve the barayarou section with the wayback machine doesn't find anything.
I only ever used the big guy, and I seem to recall that the uppercut is done by holding up at some point during the combo, and the piledriver was a 360 while grabbing an enemy or something, shouldn't be too hard to figure out. He can also suplex and do some kind of other special move that I cant remember.
I always wondered if this and Ane-San had the same development team, though somethings telling me that the development team were actually the guys that did the superb shubibinman 3. Been a long time since I was researching this shit but I vaguely recall these were all linked somehow.