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'Reverend Insanity'
Imagine each shadow clone performing mihawk level swordsmanship.
THE CHAIN MUST NOT BE BROKEN
...
Theres also izanagi and izanami
Also a chance to learn from hashrama, tobirama, learn seals from mito and get acquainted with tsunade and learn from her. But it depends on the time you are born.
I would rather choose from nara, yamanaka or akimichi clan. They have good clan techniques, have good reputation in the village, have high position in the village and will have very good relationship with the other two clans. Also a possibility to get a chance to learn the clan technique of the other two clans.
Uzumaki - very high chakra reserves + chance to get chance to obtain kaguya eye heart thing/ the sealing chains/ ability to heal others with a bite, if born before the villages destruction then a chance to learn the best sealing technique from the best sealing masters in the world but theres the impending loom of the attack, if born after the villages destruction chance of getting sold on black market or used by other villages to seal tailed beast or be used like karin
Hyuga - byakugan ( can be upgraded to tenseigan) but cursed seal, even if you dont get it your future children or grand children might be subjected to it
Senju - strong body with high chakra with higher regenerative power, good reputation with villagers, but higherups and other villages will try to kill you so that another hashirama or tobirama wont exist , will be targeted to be experimented upon
Uchiha- get sharingan but would have to go through emotional trauma + higher ups will try to kill you + will be sent to frontline during wars +even if you get to mangekyo sharingan will have to take the eyes of your sibling which should also be a mangekyo
Did he get his zanpakuto or not?
Whats the name?
Good choice author
Mihawks swordplay combined with Byakuyas zanpakuto ability, good choice. Imagine each petal with Mihawks level of swordplay + haki( armanent and conquerors) + Reiatsu
Few suggestions, dont make the mc too reliant on the system and have him learn some stuff like rasengan and kirin on his own and save points for other jutsus. Also be more creative like fire, fire and air , water and lightning style etc combos of rasengan, and upgrade useful jutsus after mastering them like upgrade the raikages technique to s rank after understanding how susanoo works or fuse it with susanoo. Just go wlid.