They never die in Naruot, they just go to another dimension so who cares anyway...

I don't even know why they care about war

Nah, they died.

I mean they 'die' but they still exist as persons in other dimension with will and every cognitive capacity as they can talk with each other in the after life.

Mkay. Proof?

You always ask for proof but I never see you proving anything you affirm (not that I think asking for proof is something bad).

Dan tells Tsunade he will be waiting for her (this is something weird to say if the meaning of this was merely that he will be waiting for her to die). Kakashi talks with his father when he is death and his father has been death for a lot of years. Also Dan has changed since his death in a way that implies that he has been reflecting on those things. Also we have seen that the mere souls in the belly of the shinigami can talk and fight between each other as Sarutobi said and that's why Minato could control his Kurama half. Hagoromo said that every souls goes to the Pure Land and they don't disappear. Rin also met with Obito in the afterlife as we can see in the manga. When Sakumo said goodbay to Kakashi (cause he was being resurrected) he said he was goin to see Kakashi's mother.

I ask for proof, bc I like making people explain the obvious.

Jiraya

I'm going with Jiraiya cause he's the one I cried over the most

Did anyone mourn Madara?