IMO zelda can do pretty well against ICs, but I've never had a lot of luck against jiggs players and I really don't think she has the advantage. Honestly in both cases, if the IC or jiggs player knows the matchup and are competant players they will probably win. ICs can camp zelda on some stages and there's really not much she can do. Puff can rest her after using farores if she doesn't go straight to the edge and can combo her pretty badly. She does not counter either of them.
I have trouble against luigis too. It seems like if you throw out any grounded attack and it doesn't hit, luigi can punish you by wavedashing in and smashing/grabbing/doing something while the attack is still out but the hitbox is gone. Jab is pretty safe, but it seems like most other options are not. Like ICs, it seems like luigi can just camp you. When you finally approach and attack, he can then wavedash away and back in, following up with an attack. Seems like maybe you have to stay airborne most of the game and space kicks, but even then it seems hard to avoid punishment after landing. Idk, I kinda feel like luigi has an advantage too.
As I see it, Zelda only counters low tiers like herself (roy probably being the biggest counter). She might be good against samus (it would make sense) but i don't have enough experience to say anything on that matchup. Her better higher tier matchups are puff and ICs, but I think it would be a bit of a stretch to say the matchup is even or in her favor.
I actually think zelda does pretty well against peach too tho. Anyone agree/disagree?