Would have to be Bonnie Bonnets for me, with Buttons as a close second. I don't really like the old lady esc look on her. Plus her hair being white makes her hair look thin due to it being more transparent. I think the curly hair, bonnet theme, white color, and the specific shade of magenta does it for me. I also don't like that her name specifically has Bonnie in it. Idk why but very obvious human names on ponies is weird to me.
Buttons is kind of weird to me. I prefer her original SS colors and version. TAF Buttons kind of reminds me of a pallet swap or something. I don't mind her as much, but I think it's the weird reuse of a character in the same gen and the pink bows that do it for me. The bow colors just kind of clash. I do like the design of the bow on her forehead though, it's very cute.
Night Glider would probably be the next one in the set I don't care too much for. I think it's just the hair color. The white doesn't look the best with her design, but I can excuse it as the hair being stars or something like that lol.
Next would be Merriweather. I quite like her, I'm not sure why people don't but everyone has their opinion
I love the design with the rainbows and everything, I just wish her hair wasn't yellow. Maybe a pink or something? A blue maybe...
After that I like Munchy. She's just so unique with the hot dogs and hamburgers, etc. Makes me think of a yummy 4th of July grilling party
Plus her color scheme is pretty cute.
And lastly, my favorite of the set is Yum Yum. I like her name (LOL) and of course the design. I guess I'm just accepted that I'm always going to be biased to pegasi. Something about the soft pink and white contrasting with the harsh reds and vibrant purple eyes is just pleasing. However, she's much less pretty when her hair is white though
I wish the "fading" pink was built to last...