M

I want him to mastered six paths sage mode and be able to use all chakra affinities along with stuff like ice, lava, acid, storm, dust, scorch, Swift release, making surpass all the previous kage combined save for ones with unique bodies. Also have enhanced version of stuff that uses sage charka added into the mix. Black lighting, blue fire, white earth, green wind, red water,

sorry but Naruto is hard work. All his sensei was literally shit who barely taught him anything. Where Sasuke was spoon-fed everything. You forget Naruto had shit poor chakra control. Along with actually sabotaged in the academy. Kakashi and jiraiya admitted they were bad teachers and not suited for Naruto. He should been basically a one man army spamming jutus and clones. They didn't even try to teach him any clones more sturdy for combat. Or use his pranking skills traps. Or teach him tactics

Only thing I can see is Naruto coming back mastering all types of chakra. Can't even access six paths sage mode anymore. Because chakra from the nine-tailed beasts was a requirement along with being the perfect Jinchuriki.

Or cal creates his own form called kestis or free form allowing to

Rapidly switch between forms in free flowing attacks. Single cross guard double-bladed dual.

Could add the spin blade as something he attaches to his dual the welding. Maybe bd-1 stores it when not in use. And can launch it to cal while mid air