Similarly one may ask, is Xayah an ADC?
Xayah is a very fun ADC, with very good mid and late game. She has lot's of burst with her feathers and a ult that makes her invulnerable which can help against assasins. Xayah can struggle against aggressive and long range poke lanes. Precision is pretty standard choice for most ADC's, and Xayah is no exception here.
Secondly, how good is Xayah? Xayah is a very good champ when your positioning and spell rotations are on point, but like any other squishy marksman champ, she'll get deleted in a hot second by Zed, Akali, LeBlanc, Fizz, etc without a Leona, Braum, Nautilus, or other tanks to jump on the assassins and CC 'em to death.
Simply so, what kind of ADC is Xayah?
She's definitely a utility ADC. I think she's a fighter ADC, like vayne or trist. she doesnt have an execute ability. According to the best AD in North America, Qtpie, Xayah is 100% a lane bully.
Is Xayah a hyper carry?
Xayah certainly has an amazing late-game, but a lot of her power is in her feather burst damage and utility. So if you consider Veigar a hyper-carry, Xayah is too, but if you consider a hyper-carry to be an auto-attack based ADC such as Trist, Kog, Vayne, or Twitch, no, Xayah is not.