Aisha is an embodiment fairy! She is the Fairy of Waves uvu I really like it bc of how she is a swimmer from a semi aquatic nation but also because she loves to move and dance! AND because she ends up with a fairy with sound based abilities, and ya know, sound waves lol. The Morphix was a gift given to her by the pixies (it's basically the forcefield-like goo they created for the dome under which they lived at the bottom of that lake) , and being fairy of waves is what makes her predisposed to being able to control it so well.
However! Layla, the fake name she uses when her parents send her away for protection, goes by the fairy title Guardian Fairy of Amethyst Lake, which is not actually a real place, but she uses it to explain why she has the ability to conjure this strange purple substance.
After Darkar is defeated she is able to switch to using her real name and fairy title at alfea.
As for Tecna, looking back I wonder if I should've just made her an embodiment fairy to begin with. BUTTT I like the idea of her being tied to Alfea like that, since she's Faragonda's apprentice (Guardian Fairy of Alfea Library), but being kind of embarrassed about it so she just calls herself Fairy of Information, even though it isn't her real title. It's like a silly bit of irony too lol.
I try really hard to plan ahead and not recon things tho so for now I'm sticking with that lmao