Honestly I kinda doubt we will be getting 8 more characters. I know there are placeholders but I'm still not sold yet. Fujin and Sheeva were leaked literally before the game came out, and we've known about Robocop being rushed into the game to replace Ash for like a month or so. We also knew about Deadpool, Soul Chamber, RetroKade, and Friendships for a while.
My point is that I think there's a chance we could be getting a few more characters later down the road, but I don't really think there's a ton more content lined up anymore because if there was, it probably would have been datamined by now lol. But I guess we'll see when the Aftermath update drops.
But still, if there are 8 more characters, these are my bets:
- Havik
- Reiko
- Sareena
- Li Mei
- Takeda
- Ash Williams (maybe he was just delayed?)
- Horror character, maybe Pennywise or Michael Myers.
- DC character, maybe Deathstroke.
I feel like these are the safest bets. For the MK characters, we are probably not getting Ermac, Reptile, Rain, Smoke, and Mileena considering Shang Tsung and Kitana have their moves now. There are some characters they could try to redesign like Kai, Daegon, Taven, Drahmin, etc, but I think the ones that I listed have more potential. We knew the devs still like Havik, Reiko played a big role in the comic, Sareena and Li Mei had cameos in the MKX story similar to Bo' (or more recently Sheeva in MK11) who got upgraded to be playable, and Takeda was one of the more popular new characters from MKX that was absent in this game for some reason.
Ash Williams already leaked, we know horror characters are safe bets as DLC so Pennywise or Michael Myers isn't reaching, and another DC character is probably on the table since Joker seems to have been a success. Deathstroke is one of the few that I think could fit the game because he's a big enough name, would fit right in with the gear system, seeing him do Fatalities wouldn't be crazy and unacceptable, and he was already in NRS' other game Injustice.