This is a plot bunny I thought up about having Harry Potter jump to a different body in a different universe when he's killed so he can gain experience and hopefully not repeat the same mistakes that led to his demise.
When he goes to the other body he'll live the life of the other character with no memories of being Harry Potter. When he dies as that character his soul will come back to his Harry Potter body and integrate the new memories into his old memories, making an amalgam of all his previous characters.
I made it that way for a number of reasons. 1) So that his other lives lived is canon and I don't have to spend time fleshing it out and can focus on the Harry Potter world. 2) I'm lazy.
This is a sort of outline kind of plot bunny, so it's not fleshed out very well and if you have trouble following my thoughts of why the barebones story goes a certain way, sorry.
Voldy AKs Harry Potter when he's 1.
Harry's Soul goes to inhabit Robb Stark from Game of Thrones.
Lives as Robb, Dies as Robb.
Harry's soul returns to Harry's body, albeit thinking of himself as Robb Stark, not as Harry Potter.
HarryRob grows up with the Dursleys, learning for himself firsthand how much his mother from GoTs sucked for how she treated Jon. He could have kept Jon with him as his right hand man if his mother hadn't run him off.
He realizes because of how he died how important a mistake he made by not keeping his promise because he couldn't keep it in his pants. He justified wanting the girl because of preserving the girls Honor after he deflowered her, but he lost his honor by breaking his word to the Freys. He lost sight of what was really important, his lands, his family, his revenge, because he wanted a little comfort from a pretty lady.
Because of his shitty slave life at the Dursley's and how they starve him, he realizes he's got to learn to be sneaky if he wants to eat and not be weak.
This realization and all the underhanded things his enemies did in his past life make him realize that his enemies don't deserve fairness, or his honor. His honor should be reserved for his family and allies.
He realizes that he either should have been sneakier to get what he wants (passage through the Twins) from the Freys without promising marriage, ie find something else the Freys want before going in to negotiate, or he should have kept his word to his allies once it was given.
Learning about his world, the technology, guns, bombs, etc. makes him intensely curious about history and how this advancing tech affects the world.
Before living with the Dursleys if HarryRobb was told he was going to a magic school he'd have agreed with the Dursleys that it was unnatural. But after having lived with and hated the Dursleys, anything they hate must be halfway decent, he figures. Plus it fits with his new attitude of using whatever means you have to get what you want/need from enemies.
So HarryRobb is much more proactive when he's at Diagon of getting enough books to learn about magic and the History of the wizarding world. And he's got his key from Hagrid, instead of leaving it in the care of others. He's also not a naïve 11 year old inside, so he doesn't immediately drink the Dumbles Koolaid.
He immediately labels Ron as a lackey. Hermione and her forceful ways he recognizes as her trying hard to fit in a new place, he likes her spunk. Neville's withdrawn manner he recognizes from Jon, when in the presence of his mother, meaning he expects to be picked at and belittled, so he decides to befriend him and bolster his confidence. He and his new lackey go on quest for the lost toad with Hermione and Neville, meeting and befriending many of the new kids.
Despite his sneakier ways he's still a Stark and an honorable man, plus he's found out how many of the Dark families feel about him, so he demands Gryffindor from the hat once he's seen both Longbottom and Granger going there. Got to build up his powerbase, and as the Boy-Who-Lived he's got a ready made power base.
Because of being King of the North in the past, Harry is now much more outgoing, basically turning everyone into his court, of a sorts, and not just from Gryffindor. This leads to Snape seeing him as his father's clone, and hating him all the more. Which lead to hesitation on Snape's part when Harry's broom is cursed by Quirrel, leading Harry to fall to his death.
Harry's soul travels and merges with Asuma Sarutobi from Naruto.
He doesn't have any memory of being Robb Stark or Harry Potter.
Lives and Dies as Asuma Sarutobi.
Harry's soul travels back to his body, and his memories of his life as Asuma Sarutobi merge with his memories as Robb Stark and Harry Potter.
Harry now has memories of two and a half lifetimes. One life is a young man who was pushed into the leadership role before he was ready but was growing into it. Unfortunately it was during a time of war and his mistakes ended his life prematurely.
Second Life was of the son of a leader who felt his father never gave him enough attention, so his personality developed to be deliberately laid back and not seeking to be a proactive leader. When he's given a newby genin team to train his laidback attitude and mental issues from his dad led him to spend too much time just hanging out and "being there" for his genin rookies. Unfortunately with this laid back attitude he didn't push his rookies to excel and grow as ninjas. As a result when they were out on a mission they met an enemy that was practically unkillable, and he was worn down and died as a result. His rookies weren't prepared for that kind of enemy. He didn't do a good job preparing them to make the transition from youth to leader.
(The half life is from his actual time as Harry Potter.)
When Harry wakes up in the hospital they tell him how the fall from his broom caused him to be injured and at one point his heart had stopped, leaving him dead, before they got it started again.
By this point Harry is seeing a pattern. He died at 1 and lived as Robb Stark. He comes back to his original body until he dies at 11 and lives as Asuma Sarutobi, and now he's back again. He finally starts identifying as Harry Potter, and not Robb Stark or Asuma Sarutobi, but he's still only starting to establish himself as Harry.
His life as Asuma taught him a few lessons. The impact one has on their subordinates, children included, and how not making time for them, or lazy teaching can negatively impact their lives. Basically how weighty the responsibility of leadership is.
He realizes someone is out to kill him still, and that as a leader he needs to take into account his security, otherwise he'll leave his subordinates in the lurch. He still doesn't know what happened to his team in his life as Asuma, or how his family fared after his death as Robb Stark. He quits Quidditch so he can have more time for important life saving things like training.
Before with his sword training he'd learned as Robb he'd done much exercise, but now with his ninja training his exercising raises to new levels.
Because of his ninja training he's much more suspicious. So when he starts seeing clues lying around about the stone and the protections, he doesn't buy that it's a coincidence. Someone is trying to lead him by the nose into battle. He doesn't want his people to get caught in the crossfire unprepared, so he sets up his defense association and spy network.
At the end of the year when he realizes someone has gone after the stone he informs McGonnagal of it, she blows them off like normal. Instead of going into the traps themselves, he recruits his associates and they prepare a trap gauntlet outside Fluffy's door, keeping themselves safe and protected while bombarding and capturing Quirrel, whose body finally gives out and he dies.
When they suggest Dumbledore contact the DMLE, he assures them he'll inform who they need to. Harry decides he'll see just what Dumbledore does, it will tell him how much he can trust the man.
His Defense Association mobilizes and makes sure every student has a matched wand at the beginning of second year. Harry makes sure of this after finding out Ron and Neville had poorly matched wands.
Second year all decent first years get folded into the association and receive actual training. So when people notice Ginny is acting strange, there's an intervention after Halloween. Her parents, the DMLE, and St. Mungo's are called in because Harry has learned he can't rely on Dumbledore to do what is needed for his people. They find she was being controlled and energy drained by the book horcrux.
Talking to Amelia Bones, they realize Dumbles just blew them off previously. He can't be trusted with big decisions. They can still use him for his knowledge and contacts though. No need to fall out completely unless Dumbles continues to make poor decisions.
Unspeakables called in to take care of horcrux, they don't know there are multiple horcrux. Harry asks them to run a scan on him, because his 2 deaths and other lives are very unusual. Finds out he used to be one, but is no longer. He wonders if that is why he's basically on his 3rd life, and vows to make sure he actually grows up and has kids this time. No more dying, dammit.
Unspeakables find out there were more than one, there could be more. They start search, but have no idea where to look. Dumbles still isn't volunteering info, so no one knows Tom Riddle was Voldemort so they have no idea where to start looking.
By end of November there's been notice of how some older female association members are acting strange, seem to have missing memories. DMLE is called. Memories unlocked, Lockhart arrested. Auror replaces him for DADA for rest of year. Dumbles losing more political clout, but he's not out yet.
Harry figures out some sneaky way to free Dobby. Harry feels honor bound to reward Dobby for the warning of danger. He binds Dobby as a vassal.
Summer comes along, Sirius busts out. When harry finds out he makes a point to dig for information. Talking to professors turns out useless. They never talk, sacks of shit. He digs through enrollment records. Writes to Sirius's classmates for their honest recollections. Finds out Lupin was close friends with his dad and Sirius and Pettigrew. Demands answers, Lupin tries to evade, but Harry is having none of it. If he's in danger from a mass murderer, then his people will be in danger too. And Harry can't rely on someone else to "take care of it so he can have a childhood" or other such nonsense. Get's the whole story from Remus. Wait, your friend turned into a rat? Only thing they found of him was a finger?
Once again it's proven that sharing information and working with people works a hell of a lot better than keeping your cowardly mouth shut and hoarding information. They catch Pettigrew. Have his trial a month later, prove that Sirius didn't do it. Sirius finally shows up, starts getting treatment at st mungos. Rest of third year is spent on training and solidifying his rule over everyone. Making sure his people have everything they need to succeed.
During summer Harry goes to Quidditch tournament with Weasleys, Sirius, Remus, Neville, and Hermione. When they are at top box, because of his ninja training he senses someone in empty seat Winky is keeping open. He has no proof they mean anything bad, but he keeps an eye out. When Barty jr tries to snatch Ron's wand, Harry catches him. Both Crouch's go down, get the kiss. Lol, ninja for the win.
Winky becomes Potter Vassal. She and Dobby hook up. Dobby deserves some nooky.
Triwizard tournament. Harry's name doesn't come out of cup. Year is normal. Neville asks Ginny to the dance. Harry asks Hermione. Ron doesn't ask anyone, Harry pushes him to get out of his shyness and ask a third year. He's been working on training Ron to be a decent knight/vassal. He knows how badly embarrassing social moments can go, so Harry just says NO to Ron's trash dress robes, and hooks him up, with some work to pay off the costs to preserve his pride. The association has dance and etiquette classes leading up to the dance so it's nowhere as cringe induced drama as canon. Ron doesn't blow up at anyone because Harry has been training Ron to be a proper vassal instead of lacky or volatile best friend with jealousy and boundary issues.
Last hogmeade weekend someone imperiused one of his friends to give harry a portkey. Bad move they didn't stun him first. He captures the DE and Voldemort, killing Nagini. Mirror calls Sirius, who gets the DMLE there. With voldy on ice, they can try to mine him for info and finally track down his whore cucks.
Fleur comes from behind after her poor showing in the second task and wins the Triwizard
Moody was their actual teacher. They ran lots of drills to get their spellwork and dodging to the point he wants it. Tries to convince Harry periodically through the year to sign up with the aurors.
Fudge has lost a lot of political capitol, but with help from Malfoy's bribes he's managed to stay in. Sends Delores to teach DADA during fifth year to try to run a coupe on Dumbles.
Harry declines prefect badge, it goes to Neville. He's a much more confident man with harry's help.
After first class Harry mobilizes the association to compile all they know on the Umbridge. They get her credentials, what she's helped pass into law, her attitudes, etc. With all that info they start a multi front attack. DMLE starts investigating possible crimes, Daily Prophet runs stories on how she's unqualified to teach, why is Dumbles and Fudgy putting her in, or putting up with her?
Less than a month and Umbridge is arrested, her crimes made known, Fudge is arrested for corruption. Malfoy under investigation. Dumbles loses political capitol, but because of his reputation keeps his positions. An auror is put into the defense position again.
Harry finally has enough of Snape and Dumbles shit. Mobilizes the association. Everything about the rate of potions owls and newts are researched. What Hogwarts curriculum used to be in the past versus now. What history used to be taught. Why there's no magic customs study. By april they have enough info start the smear campaign.
Leaving feast it's announced that it will be Dumbles and snapes last year, and there will be changes in the following year.
Year six, Harry is dating Hermione. Harry has an appreciation for her skills and loyalty. She's smart, clever, and meticulous with details. She would make a very good lady to help him in his duties as a lord. She can manage business, household, and other such stuff where details are important. And he feels comfort in her presence. So all his duties are filled with a woman he can love and that is loyal to him.
New dada, history, magic customs, muggle relations, potions (no Slughorn, that fat shit), maths, English, estate management, fencing, alchemy, no divination. Life is good, no problems for harry.
End of year six, Dumbles shows up suddenly one night with a rotten hand, clearly under mental duress. Tells Harry he must come, it's his destiny. Harry follows. They go to a cave, Dumbles smears blood on wall, it opens. There's a lake inside, filled with inferi. They take the boat to the island, there's a basin with potion in it. Dumbles demands Harry drink the potion. Harry asks why. Dumbles says there's a piece of voldemorts soul in the item in the basin, but the only way to get it is to drink. Harry asks why doesn't Dumbles just drink instead. Dumbles says he's killing two birds with one stone. There's also a piece of Voldys soul in Harry, and Harry must die to kill voldy. This is Dumbles last hurray, he's going to save everyone before he dies, since the last piece of soul killed him, Dumbles brandishes his rotten hand. Dumbles tries to attack harry with spells, only for Harry to poof into smoke. Shadow clone. Pew, a stealthy harry under his invisibility cloak stuns Dumbles from behind, takes his wand. Feels the power and how it connects to his invisibility cloak. Feels a connection to the stone on the ring on Dumbles hand. Takes that too. Rush of power. Harry pushes away the sensations. He's got other things to worry about right now, like taking care of Dumbles.
He force feeds Dumbles the potions, statches up the fake horcrux, and wakes up Dumbles after tying him up. Under the mental attack of the potion, Harry is able to question Dumbles about why he's so interested in him. Learns of the prophesy, how Dumbles didn't trust himself with power after he got his sister killed, tried to redeem others to prove he can be redeemed. How he set up harry's life to try to manipulate him, but give him some life before he needed to die, and so Harry's legacy would live on as the boy who lived. (Dumbles wasn't a thief, or evil you see, merely hurt, manipulative, misguided, and the dumbest smart guy around).
Dumbles final words were the secret words to his secret library under fidelus for harry to learn from, to carry on his legacy. Harry makes it quick. A beheading, just like he learned from his father, Eddard Stark. Then to dispose of his body, he chucks it into the inferi lake, where they tear the rest of his body apart.
Harry leaves and shows Sirius the note from R.A.B. They question Kreacher, find out how his brother met his end, and take the horcrux to be destroyed by DOM.
In Dumbles library is his journal and speculation of what the horcrux could be, Harry takes that to the DOM. Chances are that Voldy may have left his horcrux with his death eaters. So at end of summer the DOM finally succeed in getting the information about the horcrux from Voldebaby. DOM contacts Sirius, as head of Bellatrix's house, he can get into her vault to get the cup. DOM also gets tiara from Hogwarts. Voldemort is no more.
Seventh year starts, Harry is Head Boy, Hermione is Head Girl, they still dating. Association is still going strong, inducting new members every year and training as Wizard ninja swordsmen, magically oathbound vassals to their liege lord, the Potter of Potters.
He and Hermione are working for the long game. Mixing what he knew as a liege lord, the son of the Hokage, and a modern day British subject to make his wizard fiefdom. He ensures his vassals get all the education they need for the positions in life they seek to attain. In return they network information, honor his call to arms, and seek to attain the justice of law all while updating and integrating the wizarding world into the rest of the world around them.
Harry eventually marries his lady Hermione. They have many little lords and ladies, they change the face of the wizarding world, and not just in Britain. They jumpstart the techno magic that their empire uses to travel the stars and colonize new fiefdoms. When Harry and Hermione finally pass from this life in each other's arms at the age of 142, he doesn't live another life. He passes on to the next to join his entire family, the Starks, the Sarutobis, the Potters, and all their friends in what some tend to call the next, Great Adventure. For what is an adventure without company?