Nope, only loop I know of is the one where you whiff your A+B desperation with Belva or Kurokishi upon boss wake up and then throw loop them ,but I think this only works on the arcade. I'll have to try that now. I also found out on Perfect G you can sometimes stun lock him in the corner as Belva with punches.
In any case I didn't do too many runs so pretty sloppy play from me but plan to play as the other characters and try what you suggested. My usual combo with Belva was grab * 2 hits * electric shock * running forward double knee into
special
and yeah Ghost Chaser Densei really stands out to me in the home console beat em ups for sure. It has juggles, special moves tied to a special bar, blocking (kinda underused imo) and OTG attacks. Only thing I don't like about Ghost Chaser Densei is if an enemy is stunlocking you it seems you can't use a desperation attack to get out, might just be me.
But yeah I hope the developers for paprium studied some beat em ups and combined all the good that was achieved from those 16 bit ports, heck even arcade.