User blog comment:CureHibiki/Pretty Cure Plus and Minus Round 7: Yellow Fever Ft. Happy Music Lovers/@comment-37117761-20191230192111/@comment-37117761-20191231023557

The reason I find Cure Soleil to be bland is because she isn't very engaging to watch. In episode 4, she was shown to have a lot of potential as a character. She's a laid-back, family-oriented over-achiever who could have been a lot like Nao or Mana. But she fell flat because most of the time, she's just a reactionary character, saying things that any character could say in reaction to some strange event. She doesn't have any major problems as of episode 40 beyond having trouble communicating with Saboron that one time, either. Her character arc of learning to be comfortable with being half-Mexican, which could have been really engagin, was only shown once in a flashback in episode 39. Soleil isn't an interesting character because her character arc completed before the show even began.

That being said, I do like Cure Milky and especially Cure Cosmo. And even though she is underdeveloped, Cure Selene is interesting in the rare moments when she's actually on screen. But whenever Cure Soleil is on screen, I just don't get much out of her.