i can't help but think each main characters are out of characters
Musa lost her tomboyish side over the seasons and she completely lost her tomboyish side since season 5 (in season 8 she reminds me a bit of Flora since Musa is now the peacemaker of the group instead of Flora in season 8)
Tecna barely have her sarcastic side of her and the discoball (can't remember which episode from season 8 though) makes me think of Musa in the earlier seasons, for some reason she now have Musa's personalities with maybe a mix of Flora
Flora speaking of her, she sounds more like Stella now, fixing someone elses problems especially when it involves relationships (it's especially seen in season 8) and since season 5 she's completely Fluttershy from "My Little Pony" now
Stella also in a way is out of character, she was a good leader in the earlier seasons and she wasn't extremely obsessed with clothes then she is in the later seasons, the missions nowadays is a joke for her, she was always the most girly-girl from the bunch but now she acts more like a child there (Musa and Flora mentioned it in season 5 a little before Stella changed into a child by a age-spell)
Bloom in a way also acts out of character but i can't put my finger on it why though but her trust issues with Sky gives me the Musa vibe when she have problems with Riven so she's Musa in a way but i can't put my finger on it about everything else though
Aisha isn't how she used to be neither, she's a lot more stubborn now ever since Nabu died, i've liked the earlier seasons of her, she looks a lot more like an outsider in the later seasons ever since then (Musa and Stella used to comfort her in season 2 when she was new but now she doesn't fit in anymore like she used to be)
you know people keep saying Tecna is the weakest from the bunch but i'd say it's Musa in the later seasons, she used to be quite strong, especially in season 2 when she defeated Stormy twice (1 when Flora and Bloom went to Sky's planet while Musa took good care of alfea and the other one with a concert) but it went backwards since season 5, the only one who didn't made a sirenix wish despite her being the first one who deserved to have a sirenix wish, season 6 she was the only one who didn't went to the legendarium world alone, instead it made the other 5 winx to go to the legendarium world to get Musa's voice back, SERIOUSLY NICK? why not get her dad kidnapped so she can go to the legendarium world alone to save her dad instead? and i think i know what Musa could've wished for with a sirenix wish and it's simulair to Flora and Tecna to like get people to love music and songs or something like that, i wished they went that way for her though
and i feel like she have least of her attacks since season 5 even though it's said to be Tecna but again they made Musa so dirty in general
i did LOVED what they did with Musa in season 7 and 8 though (in one episode in season 7 they made Musa the weakest yet she sacrificed herself with the fairy animal to save the day with the noises that were out of balance in the mini world and in season 8 she was one of the less who have earned the primestar, the other being Bloom)
Tecna may be the weakest from like based on powers since she used her powers more in the earlier seasons but she's definitely NOT the weakest in everything else, her personalities improved despite her sass being gone and she doesn't simply have 2 attacks like Musa do and she atleast used her powers so little in the mythix one while Musa didn't used any at all so she isn't the weakest in overall, it's just the powers in itself that's useless, she's more into strategy then the actual attacks though (her powers used to be offensive in the earlier seasons, now she's completely into strategy)
they quite improved Flora in personalities and attacks but i hate how she's a little more like Stella now and she's a bit more argumentative then she used to be in the earlier seasons, she still treated her sister like a little child even though she can take care of herself
besides she almost broke up with Helia for stupid reasons in season 6 and 8 (she have most of the improvements in terms of personalities and attacks compared to the other 5 winx and i love her badass side at times when it's needed)
these 3 fairies get most of the hates and i understand its flaws but they also have their strengths but Bloom, Stella and Aisha aren't always that good neither
season 4 was quite good but once Nick took over, it went from bad to worse (season 6 is my least favourite followed by season 7 and season 8 either because it's way too kid-friendly, too dark, too dramatic or because it change the animation and everything else but season 5 they made especially Aisha and Musa so dirty)