She's actually my very first 5* Unit from Battling Ursula Banner and my very first Nino, so she became my Number 1 Best Unit for like 1 year and 2 months now. If you wanna use my Nino for Rival Domains and Grand Conquest, Feel free to add me, my ID is 8225227617
I've seen some people run Gronnowl on Nino, especially in Arena, so you don't have to worry about having a buffer on your team and she gets a little boost to defenses when positioned correctly. Just something to consider!