Im not sure which tag/flair this falls under so I'll just put it as discussion until I'm told to change it.

Kanade - Normal is often associated with sound, Kanade's life basically revolves around composing due to her unjustified guilt. Fairy due to fairy being able to be a sort of "kind" type with pokemon like Gardevoir (doing anything to protect their trainer), Sylveon (being able to feel emotions and ease pain), and Audino (well technically Mega Audino but that's besides the point)

  
Mizuki - Fairy just feels right and I can't describe why, pokemon like Sylveon, Gardevoir, and Mimikyu helped me pick this type. Dark since the dark type can be used for like a trickster? is that the right word? I'm mainly putting dark for Mizuki's constant teasing and smugness, especially with Ena. Look at Impadimp for a good example. of course Mizuki is a lot more tame though. There's also like Zorua and Zoroark who make illusions as a trick and care about their kind

Mafuyu - Ice because of how cold Mafuyu can be at times when her mask is down, aswell as the association Mafuyu has with winter. Ghost because of how Mafuyu feels on the inside and being unable to feel a lot

Ena- Fire because Ena is a hot-headed person, also she has a great passion for art that keeps growing even past hardships and won't ever extinguish. Normal due to Normal also being a sort of art type, like with Smeargle 

  
Bonus 

Mafumom- Ice because Mafumom is often very cold, but in a different way to Mafuyu. Mafuyu is cold in an empty way but Mafumom is cold in a dark harsh way. Dark due to Mafumom Manipulating Mafuyu throughout the stories and dark sometimes being the "evil" type (and being called the evil type in JP). also dark has a weakness to bug meanwhile ghost doesn't, Mafumom gets bugged easily and the song for a Mafuyu focus is named Bug.

  
Unfortunately if you look at my flair I can't come up with ideas for types for the other characters as I haven't read other stories yet

  
I guess tell me if you have any ideas for types that differ from mine, I'd love to hear as long as you're not rude.

What if N25 had Pokemon Types (reasons for types in body text)