Something I added into my fan fiction (SSS), and I think that makes sense, is that all faries and witches have a main emotion they use for their magic.
Sort of like a self-fulfilling prophecy.
The emotion that most easily fuels your magic is the one you use most, therefore you revert to it often during fights, and with how much that emotion is used faries/witches show that emotion a lot when they’re not fighting especially when things are stressful—they revert back to the emotion that protects them during fights.
It doesn’t fully influence their personality (witches can still be happy as hell) but it is what they revert to when under stressful situations unconsciously, which is also why witches have a bad reputation even though it’s not really something one can control or change.
A main emotion can be changed, but your magic would still want to naturally drift towards it especially if the emotion and one’s magic has the same ‘vibes.’ Some elements are more powerful with certain emotions, and come more naturally with certain emotions when that emotion is used to cast a spell.
Different elements can share emotions, some just drift towards others more naturally.
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Main Emotion Head-cannons
~Stella: Love for her friends and family. Light as an element naturally wants to brighten up people lives, and Stella is shown to care a lot about her freinds and her parents. In my mental head cannons sometimes she cares too much
~Bloom: Pride for herself and for where she comes from. The Dragon Flame and the fire element in general is a very bright element that is valued a lot across all planets, not just Domino. Bloom has pride for Earth where she grew up, Domino, and where she comes from because they made her into the person she is
~Musa: Protectiveness. Music as an element more so versatile-y drifts towards people, caring for people, etc, because music influences people. Musa is protective towards her friend’s wellbeing, though a lot of that also has to due do her mother’s death and the loss of her connection with her father. Hers and everyone else’s are sort of both nature and nurture
~Flora: Empathy towards everyone around her. Plantlike elements (not necessarily nature, cause our girl Stormy exists) thrive on care, since they need care to grow (I know, revolutionary.) Flora is clearly very empathetic and caring towards others in the show, and that’s why sometimes in the show she hesitates to attack because empathy and magic only really works the best if the thing/person being attacked deserves it, so not angry sea creatures
~Aisha: Loyalty to those she is close with. Water leans towards a lot of elements since lol water, but mainly very ‘set’ emotions (loyalty, determination, vengeance, etc). Water exists and has a mind of its own. Aisha is very loyal to her friends and would do anything to preserve their well-being (ie, Musa in season 2) and to her family as well. Such as Queen Lushea in season 3 when Aisha saved her instead of taking back her sight
~Tecna: Determination. Technology as an element wants to get things done and is ‘productive’ as an element. It has a job to do and it does it. Tecna is determined to get things done, make plans, and make sure things go smoothly. She is headstrong on that as well
~Icy: Ruthlessness. Again, witches use more objectively negative emotions and faries use objectively positive. I know it’s cliche, but ice is naturally cold and hard. It doesn’t have much mercy especially to those who don’t understand it/underestimate it. Icy is cold and ruthless in the show, but that doesn’t mean she’s completely cold. Ruthlessness is just the emotion she uses for her magic and the one she reverts to when things are stressful, hence why she is closed off quite a bit of the time
~Stormy: The need to cause chaos. Not really an emotion, but the emotion can be a set emotion or a need for an outcome (a need for chaos, vengeance, peace, etc). Gurl controls storms, thunder, and tornadoes so that’s an element that is very unpredictable. She is shown to be impatient and (lol season 1 when she is just lighting trees on fire) just overall chaotic
~Darcy: Control, and apathy. Psychic magic naturally drifts towards the need to have control of another’s actions, thoughts, etc. This also leads to a need to control situations, oneself, or circumstances. This is also why (in my mind) psychic faries/witches sometimes get a bad reputation, because of the emotions their magic gravitates to.
The element of darkness that Darcy has on the other hand (she gravitates more towards psychic magic though) gravitates towards more ‘hurtful’ emotions such as apathy, vengeance, suffering, etc. The darkness/shadows don’t have mercy to those who don’t deserve it. Though with her using both elements (because of being Lilith’s descendant) she has a more of a controlled apathy, still mainly leaning towards control
~Iorda (my OC and whatnot cause she’s in the story this head-cannon is cannon in): Fulfilment (positive) & vengeance (negative). She for most of her time with the Winx was a fairy and uses the emotion of fulfilment (starting from season 2 after starting at Alfea) towards her destiny as the Fairy of Dark Arts (the Trix’s magical balance, and shares the same magic as Darcy).
Her fulfilment was her way of using an emotion that her magic wanted to use (uses darkness magic mostly and rarely uses psychic, and only actually tries to harness it after the events of SSS) by having a sort of apathy towards herself, turning that apathy into a positive emotion for the need to fulfil her purpose (positive emotion as a fairy.)
When she does eventually become a witch (Lilith’s magic became too strong for her to stay a fairy, and Iorda started to automatically use negative emotions after season 6 due to emotional damage caused by le Trix, which fairy no like-y) she uses the emotion of vengeance that her darkness magic gravitated towards in season 1 when she didn’t care about using positive emotions as a fairy. She also uses this emotion during season 7 and 8 cause honestly she has a lot of vengeful feelings towards the Trix at that time, and halfway through SSS when she tells everyone that she is becoming a witch
When she still used positive emotions she was very dedicated to her purpose, and then with vengeance she became more ruthless to those who deserved it