Season 2:
- Samurai Jack (Battle Pass)
- Powerpuff Girls (Shop, Day 1)
- Aquaman (Shop, mid season)
- Beetlejuice (Rifts)
This feels extremely obvious. Maybe we swap out Aquaman for Nubia, but Aquaman seems to be closer to completion.
Season 3:
- Wicked Witch (Battle Pass)
- Scooby-Doo (Shop, Day 1)
- Marceline (Shop, mid season)
- Raven (Rifts)
Once again, fairly obvious between the comics and the datamines.
Season 4:
- Dexter (Battle Pass)
- Nubia (Shop, Day 1)
- Ruby Rose (Shop, mid season)
- Sub-Zero (Rifts)
Assuming the reddit leak is fake, Dexter is incredibly obvious. So is Ruby. I put Nubia here, because starting in Season 5 I think they'll only do three characters a season. Nubia, a semi-clone, is a good way to transition into that. And lastly, Sub-Zero. He hasn't been datamined, but we have some inkling a Mortal Kombat character is in the works. He's far enough out that it's feasible to have a character we don't yet know about, and would be a good "wintery" and "icy" character.
Season 5:
- Daffy Duck (Battle Pass)
- Craig of the Creek (Shop, mid season)
- Gandalf (Rifts)
Some of the last leaked characters, plus a character who had voice references way back. I think they want to have at least one CN character a season, because of how most fan requests are from that side of the company, and Craig is from a currently running show that's already been vaguely considered.
Season 6:
- Mordecai (Battle Pass)
- Daenerys (Mid Season)
- Rosarch (Rifts)
No real evidence for these guys, just gut feelings