In both the DC and Marvel universes (and any other universe you want to use), male and female superheroes and supervillains alike have usually many love interests/suitors. The reason is that most of them are both beautiful and successful
people. After all, power in any form is attractive.
In a merged universe there are also all the additional crossover pairings that expand the number of potential couples. As the pin will go from one person to another, it will solve and create many conflicts. A person who has settled with someone else because
their crush was unavailable will suddenly find him or herself with a painful choice to make. At least, until the pin will have solved it for him.
The pin also has the power to customize every copy to better suit the person it is destined to. The pin's main function is after all to ensure that there will be no broken hearts. For example, if a potential lover was bothered by your choices in life, the pin
would create/'drag from a parallel universe' a copy that has done different choices that wouldn't come in the way of a relationship. The pin can even modify or remove superpowers from a copy if those were the reasons love didn't bloom as well as make evil
copies of a superhero or good copies of a supervillain.
Of course, this has the potential to destroy the established balance of power between good and evil, to tip the scale of power between either trusted or reluctant allies and to forever topple the traditional hierarchy within great kingdoms and organizations.
Not to mention all the problems that will arise from the already overpopulated superhero and supervillain communities. A team might for example end up with ten copies of their leader or a member without superpowers will display new abilities they never had
before.
Although, this might also solve many problems typically encountered by superheroes, like the necessity of a secret identity. A person might end up split between copies of him or herself that will each live out only one aspect of his or her life.
Who will be the Anti-Broken Heart Pin's first subject/victim?