Superheroes? In MY roleplay? It's more likely than you think. It's set in a metropolis known only as 'The City' which had its entire police force disappear in fall of 2008 (when the game began). Their replacements are characters pulled from other worlds by an advanced machine known as the Porter to serve as 'heroes', with previously-unpowered characters gaining superhuman abilities in the process. Known for being very fast-paced. Found here.
All of the Other Reindeer: Relations between the PCs or ' Imports ' and ' native ' NPCs tend to be... strained at best. Justified by the amount of chaos the characters' presence has caused in the City. However, Imports have since gained much more acceptance along with legal citizenship in their new home, since they helped save thousands of civilians from the HIVE.
Cardboard Prison / The Alcatraz: The facility for imprisoning captured supervillains, nicknamed Superjail, is an impregnable high-tech fortress... which bad guys still regularly worm their way out of.
Car Meets House: Two of the X-men went for a drive that did not end as planned.
Celebrity Paradox: Dealt with in-game. The instant a fictional character is Ported in, all media materials (films, books, games, etc.) related to them are erased from reality. They can be recreated if the character leaves, though.
The Commissioner Gordon: Standard policy for the understaffed police force, which has little choice but to cooperate with vigilantes in order to keep the City safe.
The Corrupter: Usually takes the form of malignant mentorship: Daken (with Electro), Norman Osborn (Reilly Tyne, Rose Lalonde), Edward Nygma (Katurian Katurian, April Ludgate, Eridan Ampora), Boyd Langton (Midii).
Cosmic Retcon: The 'Running the Gauntlet' plot saw the reality of the Cityverse rewritten to introduce new elements like ghosts, aliens, and fictional countries.
Elite Mooks: Villains have tried a variety of ways to make their minions a match for the heroes, such as turning them into vampires or outfitting them with body armor and rocket launchers. It rarely helps.
Hate Plague: Cylon-Nazi nerve gas that slowly drove people into conflict with each other.
Holding Out for a Hero: The initial premise of the game was that the player characters were the only hope of restoring law and order in the City after the police force vanished. Since the government declared the place a disaster area and failed to act, it was up to them to fight crime and rebuild the justice system.
Killer Robot: Partially averted, since most robots are turned mostly human when brought into the City.
Legion of Doom: The Coalition, a loose grouping of the City's villainous characters.
Leno Device: Sometimes news posts will appear, offering a native's-eye view of how the presence of the player characters is affecting the world.
Like Reality Unless Noted: The game's setting is almost exactly like the real world, except for details like having Superior Purchase instead of Best Buy and a different President. And of course all the superhumans.
Muggle Power: Vulcanus' ideology appears to be Type One: stealing powers from Imports for the sake of giving them to 'the people.'
Mundane Fantastic: Aside from the occasional superhuman brawls, the people of the City try to carry on as usual. The City's culture has adapted to the situation so much that there are even superhero-themed strip clubs.
No FEMA Response: New York City has lost its police force? Don't expect the federal government to do anything about it! Possibly justified by the fear that anyone they sent in would just disappear as well.
Red Shirt / Red Shirt Army: Ordinary cops, soldiers and civilians stand almost no chance against most Import supervillains.
Reed Richards Is Useless: Averted. The presence of so many super-geniuses and advanced technology users Ported in has already begun to have impacts on health, technology, and international politics.
The Reveal: Several: Iron Man is actually a sentient suit of Tony Stark's armour. Los Angeles is run by a massive criminal conspiracy. The President is Stan Lee. And an international conspiracy is seeking to mass-produce superhumans.
Running Gag: Many, in and out of character: bueno, Norman's computer, eating glass, the Major's weight...
Status Quo Is God: To a certain extent. The City will always have enough crime to keep the heroes busy, but will never be wrecked too badly to recover, and the Porter will always continue bringing in new characters.
Storming the Castle: At one point a large number of characters launched a massive attack on the HIVE. It succeeded, but the HIVE remained a threat for a while longer. Two years later, a Vulcanus base in Greenland was assaulted in order to prevent the creation of a superhuman army.
Superpower Lottery: Many of the powers granted by the Porter are bizarre, such as generating teacups at will, making it rain baseballs and extremely good apple pie, and extreme sandwich-making skills.
Superpowered Mooks: At one point the HIVE attacked the City with an army of superpowered mutants.
Super Registration Act: A common worry of Imports, especially the X-men. Superhero activity is currently permitted and loosely regulated by the authorities- basically, the main rule is "don't be The Punisher."
Wham Episode: The revelation of Iron Suit, the introduction of the HIVE and their subsequent assault on the City, the disposal of the Iron Suit by the Porter, and the entry of Vulcanus were big game-changers.