I like the ideas behind this, however, I want to see some of the other lesser-known characters like Liam, Vancleef, and others. If Arthas was to return they better make it awesome not just someone who appeared out of nowhere sorta ordeal. Another few characters I want to see is Taelia Fordragon and Tess Greymane. For Taelia being Bolvars daughter and having that just plotted out and her not to play any more significance would be ridiculous and I bet a lot of people would hate that if she doesn't appear in later expansions. As for Tess, I would like to see her take on a more leadership role within the future, I would just like to see more of these characters making a greater significance.
I don't really get why is Jaina and Tandred doing there. They're not dead as far as I know (but I surely wish it was the case for the former) it feels like they're pointlessly shoved in there because ofc we cannot get enough of silly Jaina.
SHUT YOUR MOUTHS! YOU WILL NOT SPEAK LIKE THAT TO JAINA! ''You minions of Sylvanas!''
I'd like to see Varian there. Would be interesting.
Neltharion? we seen ysera so why not.
basicly pretty much every boss we killed and every friendly npc dieing in the quests(story) "on" azeroth could be in Torghast and the shadowlands
Personally I want to see Garrosh in the final raid alongside Arthas as a duel boss having become servants of the Jailer and when we kill them we get to see them both dragged to Super Hell before Lady Liadrin thanks the party by taking off her armor and ole dancing while a laser sharks fly around, but that might just the be 14 Rumsey Rums I had.
Alternatively, we know that time and reality is #$%^ed in Torghast. Jaina may very well die in the future, and we still see her because of time being weird.