He's a Hyuga not a Uchiha so his guard will be somewhat lowered with him. Besides he wouldn't expect him to be able to learn it at all regardless.

Primary- Lightning, Secondary- Wind, Third- Fire and as a Nara he has an innate Yin affinity. As for Yang it's completely up to you. The more he trains his body the greater his affinity for it regardless.

His experience with Shadow Clone jutsu should be much higher. It's like he doesn't train it at all.

I'm hoping it's Ruby Rose's character from the John Wick 2 movie. She can be MC's personal bodyguard since John will be busy training the recruits, going on missions and managing the organization. MC can seduce her after hiring her as a life long bodyguard. There should be a name for it but I forgot what it was.

His soul crossed space/time to reach the Shinobi World so he should have an affinity for space/time ninjutsu. He can use his parents contributions to apply to learn Flying Thunder God and his own contributions to learn the Rasengan if it has been created. If it hasn't he can create it himself along with Chidori.

No.

Snake Summons.

Swift Release for sure. Speed is absolute. Use the Creator perk to recreate the Chimera technique and then perfect it. Absorb genetic material from the Uchiha, Senju, Uzumaki, the clan whose illusions affect real life and the clan who can control their bones to fight.

LOTR sword is better though.

A bit longer and thinner would be nice.

Toad.

No.

The Black Pearl!!!

He can build The Black Pearl himself just fine. Meet the master shipbuilders and merge their shipbuilding skills together. A galleon made with blackened wood and brass fixings a black flag with threaded gold trim and sigil of House Blackfyre. He can also carve the likeness of the gods into the ships mast or railings to receive their blessing for their domains that are relevant to the ship. Lord of Light makes it fireproof. Drowned God makes it unsinkable. Etc.

Go for it.

Do her anyway.

Goddess of Knowledge and Wisdom. Plus Ultra!!!

I have a suggestion if you like. You can have your intended harem become the Uchiha main branch and have those you're not fond of or don't like but they like the MC can be given the chance to be a part of the newly established side branch of the Uchiha that the MC will create after achieving his goals.

The benefits obtained from leaving the village with Orochimaru far outweigh the risks especially when OG Sasuke was able to beat him with just 3 years of dedicated training while current MC will have many more years of training to build an exceptional foundation for future training especially by Orochimaru. Orochimaru wouldn't try to possess Sasuke until his Sharingan was fully mastered his various jutsus were honed to the extreme and body trained and enhanced to perfection.

MC could take ideas from the shows and movies recreate them in real world and use them for reference in his shows and movies and books including comics.