''The Leaky D20'' is a CampaignComic based on the [[Film/HarryPotter Harry Potter films]]. Written by Arkbrik and posted on Website/DeviantArt, it tells the story of Catherine (the [=GM=]) and Dan, Robin and Emily (who respectively play Harry, Ron and Hermione). Posting intermittently at the moment, it is partly through the fifth film, ''Harry Potter and the Order of the Phoenix''.

The first strip can be found [[http://arkbrik.deviantart.com/art/The-Leaky-D20-no-1-256949004?q=gallery%3Aarkbrik%2F32437267&qo=218 here]].

!!This series provides examples of:

* ActingForTwo (InUniverse): Harry's player, Dan, also plays Vernon Dursley, and he really likes roleplaying Harry's abusive childhood.
* AdaptationalVillainy: Vernon Dursley is much more abusive in the comic, often threatening Harry with snakebite.
** Snape really did try to kill Harry during his first year.
** [[spoiler: Gilderoy Lockhart]] is the heir of Slytherin, and he caused the attacks during the second year to take control of Hogwarts.
** Among the founders of Hogwarts, [[spoiler: Godric Gryffindor]] was the one who wanted to rule the school.
* AdaptationalHeroism: Voldemort is portrayed as keeping a fair balance between the Vampires and the Werewolves, at least until he was overthrown.
** [[spoiler: Marge Dursley]] is reasonable, friendly to Harry, and a ranger; averted by ''Harry'' and his FantasticRacism.
* AlternateCharacterInterpretation (InUniverse): To be expected, seeing as the plot runs quite differently from the source material. Lucius Malfoy and Mr Weasley are friendly coworkers, and Draco is far nicer than the original. Conversely, Dumbledore, Snape and McGonnagal are far nastier, with the last one wanting to ''eat'' the protagonist because she is a werecreature. [[spoiler: Marge Dursley]] is not only friendly toward Harry but is (at first) the new teacher of Care of Magical Creatures. Neville Longbottom is genuinely competent and respected, coming from a long line of heroic vampire hunters. ''Voldemort'' has arguably pure motives. And the protagonists are generally a bunch of unliked jerks because they're acting like self-centered adventurers.
* CripplingOverspecialization: Emily points out several times that the main problem of their party is having three mages. She tries to fix this by creating alternate characters for herself: a felineborn fighter/rogue (Hermione after taking the 'polymorph' potion) and a ranger ([[spoiler: Tom Riddle]])
* DecompositeCharacter: [[spoiler:Tom Riddle is a separate character from Voldemort]].
* DeusExMachina: When the Ford Anglia turns up to rescue Harry and Ron from being eaten by spiders, Ron announces, "See? There is a god! Of the machines!"
* EvilGloating: Subverted. Not only are Voldemort's motives not entirely evil, his monologue keeps getting interrupted, and Harry escapes before he can finish.
* FantasticRacism: Harry hates monsters (whether were or vampire) and sorcerors.
* FuragainstFang: Snape and his vampires against Mcgonagall's tribe of werecreatures.
* GameBreaker (InUniverse): Emily's constant use of feats.
* LowCultureHighTech: Emily uses a computer to search for information on Nicholas Flamel. Then when Catherine asks her to justify her Out of Character Knowledge being used by her character, she says [[spoiler: "I used a Computer. Duh." implying that Hermione had gone home for the holidays and simply run a Google Search.]] If only all Muggle-Borns were that smart.
* MasterOfNone: This is basically how Dan's spell selection is decided at the start of the Campaign...
* OffTheRails: Within the first three pages.
* RocksFallEveryoneDies: Catherine does this in ''Chamber of Secrets'' when the others question her plot.
* SignatureMove: Levitate Object is the party's all-purpose spell.
* SureLetsGoWithThat: After the final battle of the first campaign, Dan/Harry asks Dumbledore if the villain he fought was Voldemort (a character from Harry's backstory). Catherine decides to accept this idea.
* TokenEvilTeammate: Emily.
* WhatTheHellIsThatAccent: Hagrid, at first. When it turns out that the players can't work out what he's saying, though, Catherine decides to drop the accent for him and it's never really mentioned again.
* YouAllMeetInAnInn: The planned beginning of the campaign.
* YeOldeButcheredeEnglishe: Moaning Myrtle talks like this. After Robin points out that she died only fifty years ago and should speak as though she died in the '60s, she [[RedScare blames Communists]].