As per https://forums.darklordpotter.net/showpost.php?p=419200&postcount=34 , I've expanded the bunny into a little more of a proper challenge:

A forty-five-year-old Harry awoke with a start, sucking in a huge breath as if he had been suffocating. He immediately rolled to the side, behind a pair of crates, kept his wand at the ready, and took stock of his surroundings. It was night and it appeared that there was no one around. He was in an alleyway between two buildings – old buildings by the looks of them. The last thing he remembered was battling dark-wizards in Hogsmeade in an alleyway similar to this between Scrivenshaft's Quill Shop and Gladrags Wizardwear.

Harry’s breathing slowed and he cautiously lowered his wand. He slumped down into the corner between the crates and the wall as his pounding heart calmed. What happened? Where was the battle? What was going on here? Harry stood up and shook his head to clear his mind.

“Ostende Tempus,” Harry incanted. Silvery smoke billowed forth from his wand tip and shaped itself into shimmering numbers and letters: 23 July 1991 10:30 P. M. Harry’s mind boggled. How in the hell had he managed to travel back in time? Then it hit him. He had the ultimate opportunity to make things better. Still, he had to be sure. Was this going to be as the way Time-Turners put you into the past and you simply were a part of it, unable to affect anything? Alternatively, was this something entirely different? Deciding he would experiment, Harry Disapparated.

With a soft pop, he appeared before Number Four Privet Drive, Little Whinging, Surrey. Looking through the window, he noticed light emanating from the ventilation plate on the cupboard door beneath the stairs. He walked over to door. “Alohomora,” he whispered and the door unlocked. So far so good. Once inside, he pointed his wand upstairs and whispered, “Muffliato,” effectively insuring that his conversation with his younger self would not be overheard.

Harry walked over and opened the door to stare into the wide, frightened green eyes. Right then, he knew. This was not the same as with Time-Turners. He never recalled meeting himself in his own past, except during his third year. He was not fading away into non-existence, so the only explanation of which he could think was that he was somehow transported not only back in time, but also to a different dimension. That meant that anything he knew of his own world was knowledge he would have to take with a grain of salt, and any changes he made would render whole swaths of his memories moot. Still, he reasoned, some things were going to happen no matter what he did, unless of course he actively worked to change those things.

“Who are you?” the little boy asked fearfully.

“I’m you, from the future. I’m here to make things better. Would you like things to be better?” he answered, holding up his messy bangs and revealing a scar just like the boy’s.

His younger self nodded yes.

“Great. Then get dressed, get your stuff packed, and I’m going to go make sure our Aunt and Uncle know what’s what, if they know what’s good for them. The boy nodded again and started dressing. Harry shut the cupboard door to give him privacy and headed up the stairs. He entered Petunia and Vernon’s bedroom and pointed his wand at them.

As he worked his way up the ranks in the Department of Magical Law Enforcement, Harry had spent time as an Obliviator, and learned how to fine-tune his Obliviations. He made short work of eliminating any trace of memory of Harry Potter’s existence in their minds, whilst leaving the rest of their memories intact, though modified ever so slightly to fill in gaps left by his younger self’s removal. He went back down stairs, where Harry the younger was waiting for him. The elder Harry vanished Harry’s cot and made the cupboard into a perfectly normal broom cupboard. Harry canceled the Muffliato and locked the front door. The two joined hands and the elder Disapparated the both of them.

In Headmaster Albus Dumbledore’s office, a silver ball whirling around within a glass bell fell out of the air to the golden plate below it, rolling around a bit before coming to a stop. The Headmaster was asleep.

-----

A forty-five-year-old Harry awoke with a start, sucking in a huge breath as if he had been suffocating. He immediately rolled to the side, behind a pair of crates, kept his wand at the ready, and took stock of his surroundings. It was night and it appeared that there was no one around. He was in an alleyway between two buildings – old buildings by the looks of them. The last thing he remembered was battling those damnable Aurors in Hogsmeade in an alleyway similar to this between Scrivenshaft's Quill Shop and Gladrags Wizardwear.

Harry’s breathing slowed and he cautiously lowered his wand. He slumped down into the corner between the crates and the wall as his pounding heart calmed. What happened? Where was the battle? What was going on here? Harry stood up and shook his head to clear his mind.

“Ostende Tempus,” Harry incanted. Silvery smoke billowed forth from his wand tip and shaped itself into shimmering numbers and letters: 23 July 1991 11:00 P. M. Harry’s mind boggled. How in the hell had he managed to travel back in time? Then it hit him. He had the ultimate opportunity to make his rise to power happen when he was young and not middle-aged. Still, he had to be sure. Was this going to be as the way Time-Turners put you into the past and you simply were a part of it, unable to affect anything? Alternatively, was this something entirely different? Deciding he would experiment, Harry Disapparated.

With a soft pop, he appeared before Number Four Privet Drive, Little Whinging, Surrey. Looking through the window, he noticed only darkness in the home – everyone must have gone to bed. He walked over to door. “Alohomora,” he whispered and the door unlocked. So far so good. Once inside, he pointed his wand upstairs and whispered, “Muffliato,” effectively insuring that his conversation with his younger self would not be overheard.

Harry walked over and opened the door to stare into a dusty, and very uninhabited broom cupboard, filled only with cleaning supplies. What the fuck? Where the fuck was his younger self? Harry double checked himself to make sure he was not inside his younger self. He slammed the cupboard door shut and stomped up the stairs.

Entering the Dursley’s master bedroom, he flicked his wand and the two were yanked up into the air, hanging upside down as if an invisible rope were tied to one of their feet. They were screaming and Petunia did everything she could to preserve her modesty as her nightdress flopped down over her face.

“WHERE THE FUCK IS HARRY POTTER?” Harry yelled with a snarl.

Vernon and Petunia regained their composure quickly enough at that. “Who is ‘Harry Potter’?” they asked with genuine confusion. With a vicious and brutal Legilimency probe, he confirmed that they honestly had no clue who or what he was talking about.

He canceled the spell suspending them in the air and they both fell back onto their beds. “Avada Kedavra!” Petunia was dead. “Avada Kedavra!” And so too was Vernon.

Harry Disapparated.

-----

Challenge:

This world is not technically an AU, but the canon universe. Canon Harry was just rescued by an AU-Good-Harry who has somehow (up to the writer) been transported into the Canon universe.

1. AU Good!Harry is a 45-year-old Senior Auror who in line to become the next Director of the DMLE. He's served as a Hit Wizard, Obliviator, and Auror. Over all, he's a good person who "does the right thing," at least, as best he can. He defeated Voldemort in his time-line in the same way Canon Harry did - the time-lines just are not distinguishably different.
2. AU Evil!Harry is a 45-year-old newly-self-appointed "Dark Lord" and who was prosecuting a full-blown Wizarding War. He also defeated Voldemort in his AU, but only so he could eliminate the competition, so to speak. He's a evil bastard, but not crazy like Voldemort ended up being - he learned from Voldemort's mistakes.
3. Neither of the AU Harrys should know about the other AU Harry - at least, not for most of the story. They should work to affect change towards their own goals, but each one should consistently discover something radically different from what they expect - back-and-forth. In the promo, Good-Harry's put a kink into Bad-Harry's plans (unintentionally), but Bad-Harry will now go put an unintentional kink in Good-Harry's plans next, and so on. I leave it to the author to figure this out.
4. The material should be canon-complaint as much as possible. Please no noble titles, Goblin-friends, or super-trunks-with-mansions-inside, and all that rot.

Anyway, hopefully y'all won't hate this one.

 

My eyes... D:

 

I like the concept. I don't like the font. Please fix so my eyes don't hurt.