Lets begin, It will be long
Kaguya in Fourth shinobi war, didnt knew ninjutsu, At the time of dying, she copied the Naruto clone jutsu and spread her clones in different dimensions before getting sealed to revive the divine tree again, She was over powered and can do that. Her shadow clones have ability's to contaminate the people’s soul and turn them against each other as per her will. So war ended and nobody knew her this power. But her shadow clones cant be killed untill tapped in a body.
After the plot of Naruto : the last movie, Hinata is pregnant with boruto, Sakura pregnant with sarada, kaguya want to take over their souls as they are her descendants. However sakura travels with sasuke to protect sarada, and In an massive clones barrage attack, naruto fights kaguya clones and one of clones get planted in boruto before even born, Things are at peace after 3 years. Sasuke and Naruto builds up a protective shields for their kids and give some of their powers in order to avoid any future attack. Naruto and sasuke both travels to different dimensions to seal the kaguya clones. They handover the boruto and sarada to toneri to keep him protected over moon, however toneri is killed by kaguya. Mitsuki was born as child of toneri and oruchimaru and given task to protect the sarada and boruto . before Leaving to the kaguya mission, hinata is pregnant with himawari
Boruto and sarada brought back to konoha and raised well, joins academy.
Since they have not been in konoha, they dont know the history of it. Kaguya keep on planting the hatred in boruto for his dad treatment from villagers as nine tailed fox, death of his uncle neji, destruction of his uzumaki clan, death of nagato, etc. Boruto is dark, manipulate people and do things to revive divine tree as under the control of kaguya. Boruto act as some dumb infront of others and try to form an organization to take over village as shady ninja. but some voice keep him telling to hold back. His friend mitsuki, sarada, hinata, stories from iruka etc. In an attack at the age of 6, Villagers know the kaguya is sealed in boruto, they start hating him as well. Kakashi train him under his supervision to control the power
Sarada also want to restore his clan, and curious about Madara and admire Itachi, hates his dad for killing Itachi. she awakens her sharingen. She is extremly skilled with jutsus and want to meet itachi. she does reanimation jutsu, and get trained by itachi herself, but still hold grude against the sasuke who went against konoha. she wants to take the rinnegan from sauske to restore his clan. she was always curious why he didnt revived his uchiha clan even if he had the power to do so. sarada admire the itachi goal as leaf shinobi and vows to protect it as boruto unfolds time and again attacks on village in shades by akatsuki members. Nobody knows that its boruto who is doing.
The Madara descendent Kawaki , is a ten tails jinchuruki who is wise and knows kaguya needs to be destroyed as an outsutsuki is required to be sacrificed to gain the power control of chakra fruit, he wants the chakra of all
Shikadai- He aspire high level shinobi instead of strategist. He is admired by Gara, and trained under him
Inojin- Sai leads Black anbu ops, Inoin uncovers each black anbu ops by mind reading techniques derived from Ino. Inojin find difficulty controlling emotions as sai, as going through the pain and suffering of each mind haunts her, he train under tsuande to see how suffering can be cured
Cho cho: should be made thin and wanted to become chubby like his father, to gain power
Kiba and Akamaru, Shino : taking care of 2 tailed beast
metal lee : Training hard to open 8th gate and bear death with controlling physical damage. He trains around other villages to understand the death and pain
Sakura handling the 5 beasts due to her massive chakra control.
Hinata and Hanabi training himawari to protect boruto, As himawari is a most adored person by boruto
Kaguya corrupts each of their souls and they overcame with direction of their parents, could be greater character development
kawaki unfolds his cards one by one. Boruto becoming negative and needed to be saved. Sarada and mitsuki decides to reanimate hashirama, and train the boruto himself to control himself.
Kawaki becomes friends with boruto as both gone through same hatred, otsuksuki used kawaki as mere chakratool and boruto being full ‘of hatred . Kawaki helps boruto to gain control over kaguya along with hashirama. Kawaki goes through transition however kaguya corrupts his soul now. Boruto wants to save kawaki from kaguya hatred and planet destruction.