Their mother would always be very open about who was her favorite child at any point in time. It was usually Darcy (because she was a suck up) or Stormy (by default). It was almost never Icy because she was more likely to be blamed for her sister's behavior.
This led to them being so vulnerable to Valtor pinning them against each other later on.
Hair:
Icy: She has really thin hair (the ponytail is not helping) The ponytail also pulled her hairline back. However she will never get rid of the ponytail because she thinks it looks cool (pun intended)
Darcy: The best taken care of hair out of the group. Uses hair oils and other fancy stuff. However her hair does lose volume because of the length. She thinks Icy's hair looks ridiculous
Stormy: Her hair is not very well taken care of since as the only person with curly hair in their family she has never learned to take care of it. It's always a struggle with her.
Dancing skills:
Icy: No one will ever know. She is too self conscious to try. She will act like she is too cool for it (pun intended) but in reality she doesn't want people watching her.
Darcy: Also will not dance, but she does know she is bad. I just think it would be really funny if she is completely in control emotionally and is a skilled manipulator, but if you put her on the dance floor she is an uncoordinated mess.
Stormy: Like in season 8 I think she is just a randomly good dancer. Like normal people I don't really consider seasons 5-8 cannon, but I just think this is really funny. Her being good at dance us really random, but it fits her well. She can destroy anyone at just dance.
As someone who loves Stormy: how tf does she have a higher craftiness than Icy?
Winx Wiki is unhinged.
How talented at magic each girl is
Icy: She has above average raw power. I see her as being more innovative with her powers and I like to think she created the spells she used instead of learning them from others or from books. All those different ice shapes were her own creation
Darcy: Raw power wise she is actually average. However, she put in the time to improve her powers and abilities. She tends to do things very by the book and focuses on technique. None of her spells are original, but she has perfected a very large variety
Stormy: In terms of raw power she has the most, however she doesn't have the same levels of technique or experience as Icy or Darcy. She relies on strong tornados and lightning strikes, but can't manipulate them very well without lots of focus. She has the most trouble controlling her powers and understanding them because she only got a half year at cloud tower before being expelled. She isn't stupid, she just hasn't had the same educational opportunities
Heights:
Icy: 5'4/162.5cm : She just seems average height to me. Of course she appears taller because of the hair and the heels
Darcy: 5'7/170cm : This one was hard because I imagine her as quite tall, but I don't imagine riven as super tall and there is no way season one Riven would date someone who isn't at least a couple inches shorter than him. He has too big of an ego.
Stormy: 5'0/ 152cm: Stormy is small. I just love the idea of her being short and angry. It's just too funny. If she is not the shortest in the reboot I will scream.
I don't have any headcanon on what Stormy's sexuality is (besides not straight), but she is the disaster version of it
Which winx girl each of them is most jealous of
Icy: Aisha or Stella: has always wanted to be royalty, hence why she makes Knut refers to the Trix as highnesses. She's more jealous of all royals getting power, status, and nice things without having to work for it. I did not include Bloom because let's face it: Icy would rather die than live without magic
Darcy: Musa: Yes, because of Riven. She would lie and say she is most jealous of Stella if asked.
Stormy: Bloom: Bloom is the beloved leader of the Winx and Stormy is very much the punching bag of the Trix. She would kill for people to treat her like they treat Bloom
Right or left handed: I have very strong opinions on this. Why? I don't know. But I know I am correct. (I'm sure there is some scene where these girls are writing or something, but I did not rewatch to check)
Icy: Left-handed
Darcy: right-handed - very upset by this as a child because she wanted to be special. She had trained herself to be ambidextrous but lost the skill because she stopped practicing it and moved on to practicing magic more.
Stormy: right-handed - no one in winx gives stronger right-handed vibes than this character.
The trix do NOT share clothes with each other. For one, their styles are different enough that they don't really have any desire to. They actually respect each others belongings and don't go through each others things. They do really trust each other. If they did want to borrow something they would ask the other sister first and let them be the one to grab it. They may be evil and competitive, but they respect each other's space (side eye to my sister)