Thank you for the list. I actually found a few that I was missing and did want to connect.
For just Angel and Demonic... The Spike and Flourish, Oink they are feathered and angelic styled. The pegasus would fit with angelic as well. If you are doing the Brother and Sister then why not 'The Fall of the' also fit with angel so does Super Unnatural of course. The Tia wings fit with the demonic ones.
I would say do a list of all the wings! If you do you would be missing the butterfly styled astra wings, Flight of the Macaw, Fluttering Moth, all of the fairy, pixie wings and of course you are missing the cheaper ones like Bonsai, Cardboard Back Wings, Garbage Wings, Sharktooth Wings and Mechanical wings. Oh! Autumn Wings, Elemental Wings and Icicle Wings. Samba Star also has wings. It would be more interesting!