My question was, if there're any special scene or item that we can get for defeating her and not losing.
As Phenir said not really besides Heins comment if you talk to him afterwards.
Her covenant 1-3 stages drop lore that goes back to BS1...but thats about it. There is not really a point to killing her/with her boss encounter.
Another question, IIRC there were some mentions in this thread about BS3, where do you guys get this from. I looked at Ci-En and there was nothing there
Is the future project after Dead Red Hood is finished. Toro is still in the development cycle of it because they kept increasing the CGs from the original 150. DRH going above all regular mean. Apparently you will be able to lewd/tempt all the encounters. Or kill them in various ways.
BlackSouls3 will be a thing for the far future.
Ha if we are lucky maybe DRH will release at the end of the year giving us a christmas miracle.
Toro talked about this on ci-en after wrapping up BS2 DLCs. That the next plans are a new Red Hood game, 4 Demon Princesses & after these two BS3 development will start. However its been forever since that statement. So who knows what the plan is after DeadRedHood finishes.
Considering BS1 & BS2 maybe Toro will also drop some DLC for DRH down the line.