I’d genuinely like to see all 6 of them nominated. But categorising them could be hard and will definitely not be a true representation of their roles. They’re all the lead actors in my opinion. I think you could maybe say that Celeste is the main character around whom the others revolve, but even that feels a bit inaccurate. I suppose it would be Nicole, Reese and Shailene in Lead, and Zoe, Laura and Meryl in Supporting. I actually would be inclined to put Meryl in Lead swapping her with Shailene, but I imagine they will want to separate Meryl and Nicole so they both win.