i think
1. 4th hokage.........i wanted to see him fight
2. Uchiha madara....... i don't want anyone to die from uchiha clan but this 1 in particular.. i wanted to know about him...
The ones i think shouldn't die in later series:
1. Diedra n tobi......... they make me laugh a lot... infact they are the only ones in akatsuki who are funny..........
2. itachi uchiha.... i would rather watch sasuke die then itachi.........
3.kakashi.......... if kakashi dies then will stop watching this anime.......
4. Jiraiya............. cmon man......... who else can make you laugh a lot
5. kurenai.. i wish the one who attempts to kill her must die instantly. well not if its Itachi........
6. gai n lee...... if they die then there would be no one to compete with kakashi n naruto and that would make series boring to some extend........
those who should die
1. naruto....... coz i just want him dead.......
2. Sasuke.............. same with sasuke........