Mario: I used to like playing as Mario in the Mario Party games when I was younger. I respected him since he is the main character and he's always saving the day, and so I occasionally played as him in the spinoff games to give him some respect. Nowadays, I think that Mario is one of the most boring characters to play as BECAUSE he is the main character. It's like, you're already forced to play as Mario in the main platformers and RPGs, why would I want to play as him in the spinoffs when there are so many other (better) choices?
Daisy: She used to be one of my favorite characters but you all know by now that I really dislike her. I explained to LGM why I now dislike Daisy in
one of my profile posts, I don't really feel like typing all of that again.
Yoshi: He used to be my favorite character when I was younger. He was originally my dad's favorite character and I think that's why I started to like Yoshi as well. Nowadays, I don't really care about him anymore. I wouldn't say that I hate him, but I'm totally fine with letting him be on the opposing team in Mario Kart and I don't feel guilty seeing him getting blasted with bob-ombs, blue shells, or getting zapped by lightning.
Donkey Kong: He was one of my favorite characters in the first four Mario Party games, I played as him in the first three Smash games, and I also liked playing as him in Mario Kart DS. In every game after that, I just don't care about him anymore. Maybe it's because his current voice actor makes him sound really dumb and now I just think of him as another idiot who is fun to beat up.
Rosalina: I liked her better in her first few appearances when she was more mature as well as calm and reserved. I think that Mario Kart 7 is the last game where I really enjoyed playing as her. Now she's just another happy-go-lucky character and a Peach sound-alike thanks to her current voice actress. Also, she's one of the more popular characters, and I usually care less about the more popular characters.
Baby Daisy: She used to be one of my favorites in Mario Kart Wii and Mario Super Sluggers. However, I still liked her when I started to dislike Daisy because I felt bad about hating Baby Daisy since she is only a baby. It wasn't until about two years ago when my hate for Daisy increased to the point where I no longer like her baby version either.