Make a Wish (fanfic)

Make A Wish is a Harry Potter fic written by Rorschach's Blot.

After the events of Order of the Phoenix, Harry decides that he doesn't particularly want to simply go off and die in a final confrontation with Voldemort, at least not without having a chance to see a bit of the world first. What follows is a vacation that spans the summer (and a good part of the fic), and takes Harry, under the alias "Mr. Black", through several countries, adventures, and more than a few dead Death Eaters.

It also has a sequel, The Hunt For Harry Potter, by the same author.

Tropes used in Make a Wish (fanfic) include:

The Atoner: Based on a few comments of Harry's that are overheard and misinterpreted (such as promising "Never again!" to the ghosts at Auschwitz), the myth surrounding Mr. Black mutates to include the idea that he's a former dark wizard who is atoning for his sins by fighting for the Light.
Catch Phrase: When asked for more details on who he is, Mr. Black will invariably reply: "I'm just a guy on vacation."
Coming of Age Story: This is a Harry Potter fic, so that's to be expected.
Contrived Coincidence: This happens a lot.
Cool Airship: The Professor and Henchgirl's zeppelin.
Everyone Calls Him "Barkeep": Starting with the Professor and Henchgirl (who called themselves those names before ever meeting him), everyone who works for Mr. Black by the end of the story becomes known solely by their job title.
Hypercompetent Sidekick: Henchgirl, to the Professor. In fact, the only reason she got the title of "Hench" is because the Professor won a coin-toss.
Mad Scientist: The Professor, a rare non-malicious version.
Magitek: A lot of the Professor's devices.
Mistaken for Badass: There are so many accidental deaths around "Mr. Black" that pretty much the entire magical community is convinced that he's some sort of super-wizard. In point of fact, it's all just a string of coincidences.
Shout-Out: The SEP Field.
Shrouded in Myth: What happens to Mr. Black. Between overheard comments of his which are interpreted in the wrong context, all the deaths in his wake, and perfectly logical conclusions based on faulty premises, the Wizarding World -- particularly its governments -- come to believe that Mr. Black is an immortal superwizard who is the only survivor of Atlantis, and possibly the Incarnation of Death itself.
Teleporter Accident: Happens several times to incautious Death Eaters. Like the time a group portkeyed to right in front of "Mr. Black" -- who happened to be looking out from 20th-floor balcony. Or the time they portkeyed ahead of him so as to ambush him -- right onto the tracks of the train he was on.
Took a Level In Badass: Mr. Black, by the end of the story.
Weirdness Censor: Mr. Black has a bracelet that makes it difficult for people to focus on the details of his person, explicitly called an SEP Field.
Wrench Wench: Henchgirl has this as one of her "hats".