currently - apart from kaguya's sister who can challenge sasuke?

[Legendary Saiyan]

Naruto

 

[rinnegan human puppet]

only people that can stand up to sasuke are dead right now.

sasuke could easily become JJ if he wanted to and take over.

 

[-Akuma-]

Naruto beats the donkey piss outta Sasuke.

 

[shelke]

It's a dude, man. As for question, then no one.