Alright, forget about the sharingan.Forget about the sharingan. In our RP anyone can use chidori alike. The only difference is that Kakashi, Sasuke and Lightning affinity bios can use it without hand seals. Other than that its all the same. No bonus for using sharingan in our RP. Really, forget your sharingan. You rely too much on it and it leads you to overextend its abilities. A good combo is for example with taijutsu, specially if you don't need to perform hand seals for it.
Now, nagashi. You can use it in a all direction burst that spreads to SHORT range. If you want to hit something at MID range, you stretch it into a given direction. Do you understand this? Also, its just lightning, meaning that it would be able to protect you against most physical attacks. Its main use is to protect you from Taijutsu users.
Explain how you'd use that with banquet of lightning? What would be the use of that?
Taijutsu is good with chidori.
I understand you can stretch nagashi. It is most effective agaist taijutsu users.
Well, I could use banquet of lightning first underground possibly stunning the enemy. Then, all I would have to do is a short string of hand seals and slam my hands on the ground. By the time the opponent wakes up they have a a rank jutsu coming right towards them leaving them near defenseless.