my friend is finally reading reverse and occasionally emailing me her reactions so I've been skimming a few of the chapters she's on. Just wanted to share that when I got to this line: "“Incoming!” a cheerful voice calls, just as a shape comes flying at Kurama’s face. He lunges to catch it on instinct, and finds himself with an armful of green-haired little girl with wings." I immediately thought of Gai's Dynamic Entry and considering Fuu can already attack from above...
I can totally imagine Fuu taking for Gai, partly for his personality and partly to horrify Kakashi.