I don't think
needs a complete and total overhaul but I'd like to see some of her tools reworked to synergize more with Phantom Slash. F-smash, dash attack and Fair work really well with it (and are fun moves in general), so keep those the same.
But give her better anti-airs because while U-tilt is good, her threat bubble has some really awkward blind spots in the air. Part of that is Fair's fault, but if Nair has a better hitbox or if Uair was closer to her body I ruin she'd improve a lot. Or maybe swap out Bair for a good anti-air (it'd be sad to lose a lightning kick, but two is kind of excessive.
But the move that need a rework the most imo is Din's Fire. It's always been too slow to be an effective zoning tool but now it's almost completely overshadowed by Phantom Slash. Even as an edge guarding tool, you're usually much better off just setting up a phantom ledge trap, or to protect you while you go offstage for a Dair. I like the idea of making it a slow but powerful explosion around her, more like it actually works in OoT. Not so much because it'd be more loyal to how it works in that game, but because a big, powerful hitbox works very well on trap characters (it's the reason Dedede's Smashes are even usable).
has such a fun and inspired moveset...which is why it's such a shame how lousy gameplan it has. It's got a very potentent anti-air game, but no way to make you jump. It's got a very powerful ledge trapping game, but no way to push you into the corner.
A lot of zoners are designed to make you jump by throwing projectiles and then punish that with anti-airs. Maybe Plant can be the inverse of that - countering jump ins with Ptooie and Down Special and then punishing grounded approaches.
I say give it invicibility or armor on dash attack so it can use it the way Palutena does. It'd make sense since it lunges pot first. Also allow its poison cloud to make enemies flinch - if that's too powerful they can lower its damage or duration. Then give it a spacing forward tilt to round things out and give it a less commital anti-dash in move.
Anyway I'll watch the Zelda trailer later, I'm on data right now.