Nocturne needs QoL buffs.
His kit is solid, but he's lacking....he is WAY to soft to be the diver that he is, especially at plat and higher. The ONLY change I really honestly think he NEEDS is for him to be immune to damage/CC/Everything during his ults travel time. His biggest problem is ulting onto his target, and before he even connects, some random stray skill shot knocks him out of the ult, or just outright kills him. There is more than enough counterplay to take place AFTER he lands, there is no reason for him to be getting murdered in the sky.
That is all.