I love how Avatar makes the nonbenders just as cool and powerful. It’s like saying “hey you don’t have these cool powers but you can still be like these awesome characters” Korra fell in love with a nonbender. The fire lord fell in love with a nonbender. The self proclaimed greatest earthbender of all time had a crush on a nonbender. Some people argue that the fire princess fell in love with a nonbender. The avatars son was (for most of his life) a nonbender. The two greatest warriors to come out of the water tribe were nonbenders. The universes greatest bounty hunter was a nonbender. The fire princess chose two nonbenders for her small elite team. Two thirds of the gaang were nonbenders. I just think it’s really cool.
I don't think Iris would turn out like Elena in the S6 premiere. She'll most likely bury herself in her work. She kind of did the same with Eddie, but with Barry, it will just be a little harder. Barry is the love of her life and she really wanted to be his wife (Though Barry did say she always will be Iris West-Allen. Married in their hearts, can we say?). Just like in the comics, I don't expect her to get over him at all.