Ariana Grande would be interesting and maaaybe an actual possibility?
I also would like to see a Survivor castaway get cast. That Cirie rumor heading into BB19 is actually for this?
Get an athlete too but that'll be tough with both the basketball/football(NFL) seasons going on when this will air. Unless it's a retired one like Survivor gets (but more well-known than those guys).
To be fair even if the "celebs" are nobodies all that really matters in the end is that they cast good characters that bring the drama.