Seeing a lot of Peach in tourney. What is different between her and Daisy?
Because of Daisy's animations, she has a slight larger hurtbox on her dash (not the attack, her dash).
That's about it. She's just a significant aesthetic option. Richter's basically in the same spot except his holy water will kill red pikmin. Some of their other idles do shift around their hurtboxes, but nothing terribly significant.
if you had to tier the echoes based on differences it'd go like
S - Ken (x1.1 faster than Ryu (same weight, height, jump, dash, etc etc) he has 2 unique command inputs, 3 of his specials have different functions, his back throw rolls twice before throwing and about 3 of his other attacks have different data on them). He definitely got preferential treatment. I think they easily could have given the rest of his moveset a little touch up if they wanted to and had the time.
A - Chrom (no sweet/sour spot, has Roy's average power & knockback throughout his blade attacks, Ike's up special, doesnt have fire hitbox, Final Smash functions differently).
B - Lucina (no sweet/sour spot, has Marth's average power & knockback, a smidge smaller than marth). I only put her lower than Chrom because Chrom gets his own idles and of course the up special.Dark Samus (electric instead of fire (so there's a little more hitstun), different front/back roll, a little taller than Samus in her standing/initial jump, her up smash has a bigger start up hitbox)
C - Dark Pit (electroshock arm does more damage and has angeled knockback, the arrows deal more damage and can't be as controlled, different final smash.
D - Richter & Daisy
F - Alph
I'm still bummed Lucina & Dark Pit didn't get their own animations this go around, since that was by far the most important and consistent part of the new echoes. Even just Lucina using Marth's Smash 4 animations would've been fine.