Base, Charmix, Believeix, Harmonix, Sirenix(mostly), Mythix, and Faunix are the same as canon.
Enchantix-
Aisha: saving her aunt by dying in the process
Stella: Saving her father but burning out her magical core(once the magical core is gone a fairy is essentially dead)
Musa: dies when saving Galatea
Flora: Saves sister from drowning in poisoned water
Tecna: Saving one of the winx from a deadly dragon
Bloom: ..... let's just say she dies in front of her boyfriend and leave the cause of death as a mystery until we get to that part(I don't have a solid idea yet so if someone has an idea feel free to dm me about it here on wattpad)
Sirenix-
Bloom: Given to her by her father after proving herself worthy(it's essentially a suicide mission because of how dangerous the task is)
Altheaix-
Flora: saving her sister and nature at the same time
Stella: confronting her parents about how their fighting affects her
Aisha: Finally forgiving her mother(the abuse wasn't physical, it was more so neglect/mental)
Musa: Standing up to her father about her love for music
Tecna: helping Daphne overcome her insecurities about being human again
Bloom: passes a test(won't say as it's spoilers but it does take some aspects from the canon one)
Daemonix-
Bloom: I need ideas so again feel free to dm me about it on wattpad
Stella: defeating a hellhound without a celestial bronze weapon
Aisha: Stopping a cyclops all by herself
Flora: stopping a whole cabin from collapsing
Musa: holding of the Chimera by herself long enough for Bloom to kill it
Tecna: I need ideas so again feel free to dm me about it on wattpad