For every 1 awesome af character mod that comes out, there are like, 5 several mediocre to bad ones to release too. I'm happy to say that this is yet another awesome character mod, and a character pack, nonetheless!
I love the sprite work, as always, you never cease to amaze me with your sprite work for mods like Skip and Jana (can't wait for the next StephCharsOC update btw!) All the Deltarune character designs translated well into SRB2's style. The trio are expressive and none of their animations feel stiff, unfinished, edited from Sonic, or anything like that. Hoping to see a Noelle "DLC" or something later in the future. I could imagine her using her IceShock as a double jump that also freezes nearby enemies, or Snowgrave causing a screen nuke if you have 25 rings, or whatever creative thing you could think of, if you were to make her playable.
All the characters flow really well too, say, except for Ralsei. My only problem with Ralsei is that I wish I could cancel his scarf twirl whenever. I also wish the twirl could carry his momentum instead of slowing you down at a snail's pace. The slowdown makes me actively not wanna use the ability unless I'm super (or hyper using XMod).
Speaking of being super, I know you didn't feel like doing anything extra for the characters, but I kinda wish you did. It's pretty pointless to grab the chaos emeralds and they don't give you any benefits besides the typical speed and jump height increase. I'm sure you could've snuck in some lore stuff when transforming. Maybe they used the power of the Shadow Crystal or something and now they each have a new ability. Even something small like increasing their animation speed, attack time, and doing double damage would be nice.
Overall, yet another awesome mod from you! As a mega Undertale and Deltarune nerd, I've been anticipating this release for a while and I'm happy to say that I'm satisfied. Keep it up with the releases.