Wellllll, there are two types of people, people who hate 6PN, and those who love him. He's definitely a good position 1 ninja, if your pos1 is stacked af. But how good he is still depends on who you're going to use with him. He can still dies within the first 2 rounds of battles, but most of the time, he is immortal and hated for the typical 10 rounds fights. So yes, he's better than what you have currently, but not sure you'd wanna stay water main if you plan on using 6PN, it could work, yes, but he's better off with wind/earth main, or even fire main.

For what events to spend on, you'll have to figure out yourself from other forum threads. There's no one right answer for it, it depends on a variety of factors, including but not limited to, what are on sales, how much they cost, how badly you want them, how much longer can you wait, etc.

Power is always a good option to spend on, a good team is only as good as its power, after all. So that question is, again, for you and yourself alone. Only you can decide what you need most. Without us knowing your current power, and all the ninjas you own, there's not much we can advice you on the matter. And even if we know your BP, we'd still not know what you have upgraded and what you haven't, so you'd need to sum up which power function you have been focusing on and which you have been neglecting.

Best possible event to spend is probably Lucky Board during Fuku deals. Best possible outcome can come from Lucky Stars during Fuku deals IF you can get the jackpot ninja.

As spending choices go, you can go quite far without any event ninjas if you outpower your enemies. I would suggest spending coupons during Fuku Deals into Training Potions if they are available, and gather event ninjas from Fuku deals alone. You won't be able to get SOSP Naruto this way most likely, but recently there was Angel Konan for 25k, which wasn't a bad price at all.

Issue with the method above is availability of Training Potions during Fuku Deals. If there's not enough potions/command flags to redeem that week, it may be hard to find equally good place to invest into power.

EDIT

While what MonkeyLord83 said is definitely true, I am pretty sure tha Ninja Assist feature is by far the best one to spend into, unless you have all cards unlocked and at level 7+. Also with "6.0" they announced 3 new cards for the feature, 2 of them yet to be released, so saving command flags and training potions for them is not a bad idea. In CN there's 15 cards total I think.

hello again, thank you for your reply! My current level is 73 and my current power is 31k. When it comes to ninjas. Here is what I have:

[Common:]

Naruto, Sasuke, Sakura, Ino, Choji, Hinata, Haku, Shino, Tenten, Lee, Neji, Temari, Kiba, Kankuro, Shikamaru, Kabuto, Anko, Guy, Kakashi, Kimimaro, Konohamaru [Konohamaru Corps], Gaara, Asuma, Zabuza, Elder Chiyo, Ukon Sakon, Tayuya, Jirobo, Kidomaru, Sai, Yamato, Kurenai, Enma

[Sannin/Akatsuki:]

Tsunade [Sannin War], Orochimaru [Sannin War], Jiraya [Sannin War], Sasori, Hidan, Kisame Hoshigaki, Itachi Uchiha

[Cps/Events:]

Iruka, Naruto [Chinese Style], Shin [Edo Tensei], Samui [Swimsuit]

[Treasures:]

Choji [GNW], Hinata [GNW], Tenten [GNW]. Mei Terumi [Fifth Mizukage], Kakashi [Beheading Sword], Akatsuchi, Torune Aburame, Zabuza [Mist's Seven Swordsmen], Kurotsuchi, Kankuro [GNW], Mabui, Neji [GNW], Kiba [GNW]

When it comes to power features, I think I focus only on cave keys i have 1 position of runes level 7, 1 position of runes level 5 and 2 positions level 1, I also have clothing - Sailor Uniform, otherwise i cant say Ive been specificly focusing on anything.

One more question: Is it a good idea to run Sharkbomber 1st position water main team and if yes who r the other 3 ninja?

Thanks in advance :))

I meant 2 positions level 4 not 1