I'm no tv watcher ( most of the time ) but i used to watch this show and it would definetly be sasuke.....
Diedara even says Sasori is stronger than him
When sasuke kills him on his hunt for itachi acually diedara kills himself. he eats all of his clay with his big mouth on his chest and he blows himself up trying to kill sasuke with the explosion.
Sasuke
Sasuke is more stronger than Shikamura but he is smarter
Naruto is indeed stronger than sasuke
sasuke is way stronger than kankuro
Naruto is stronger then Sasuke because in episode 240 until 254 he will obtain kyubi mode that is stronger than Sasuke's susano
Kakashi clearly because Kakashi Is His master and he taught him The Chidori and The Sharingan and Orochimaru tought Sasuke some things but Kakashi is stronger than Orochimaru before he died that's why Kakashi IS stronger than Sasuke
Rock Lee is stronger than Sasuke for a limited amount of time in the chuunin exams. After that, Sasuke is always much stronger.
Sasuke
Yes, Diedara is a boy.
Yes he will.