should be a dude
with a talking shield

My opinion? I think that's Diana&Leona's grandmother.

Quote says nothing about it being related to diana/leona he was just using them as both an example and stating that the design team that came up with them is together again for a new champ.

If it isn't obvious with the MANY bird hints, IronStylus is working on some sort of bird-related champion, which may or may not be the next release, won't be "male" (not necessarily female), and it may be an ADC.
But, he could still be working on another champion related to both Diana and Leona via lore.

The Parrot has spoken!

Parrot, tell us moar about new champs!!!!!!!

Lesbian lovers?