Arachne is technically doing the same to you. You've lost already, but you can still see what's happening to Hiro after his journey is already finished. Even have a choice in that... if she's in the mood for that.
I am not entirely sure what you meant (english isnt 1st language) but I tried getting endgame with her and wasn't put in any new postmortem post-endgame area.
Ohh. I guess I get what you mean. Yeah that's cool and all but I was wondering if any other special "class" has special extra postmortem stuff after endgame like the Mare/MareWife