Well, there's some of these things in the Sonic series.
Probably the biggest of these is "Knuckles and Rouge". They're enemies. They hate each other. They've hated each other since Rouge debuted in Sonic Adventure 2 and it hasn't lead up. Knuckles lives to guard the Master Emerald. Rouge wants to steal it for herself, even though it's what keeps Angel Island afloat in the sky. It makes no sense. It's like pairing an animal-lover with a poacher. It makes zero in the sense department.
There's also "Silver and Blaze". A Sonic Team executive already stated that Blaze's backstory was explained in Sonic Rush. Ignore Sonic '06. She had no reason to be in that game. Silver and Blaze have never met. Silver is from the future of Sonic's world and Blaze is from another dimension. They. Never. Met.
There's another one that came from that game, too. "Sonic and Elise". Yeah, that's in the actual game, so it's not a fan-pairing and it's treated much more as a joke. Except... the principle is still being used to this day. There are plenty of people (mostly girls... I hope) who like to pair Sonic up with THEMSELVES. Or Shadow. He's the second-most-likely to get sucked into this.
There's another fandom that gets some of the worst in this regard: The bronies.
There is an uncanny amount of fanfictions in which major characters (who are virtually always two females) just start having sex (sometimes in public) for no reason whatsoever! Seriously! Someone had once sent me a friend request somewhere whom I hadn't met, and I tend to verify what a person is like before I accept such things. So, I checked her profile, and she was praising the work she did on this fanfiction in which Applejack and Rarity start breaking into people's houses while they're still there and having sex for no reason.
Another that at least has members of opposing genders is "Doctor Whooves and Derpy Hooves". This falls under the "One of them is already married" category. In an episode of Doctor Who, we see that The Doctor is pretty much married to the TARDIS, who is shown to be an actual living being and even takes on a humanoid form for most of the episode. The Doctor is in love with her and clearly shows it. It's not even subtle. He doesn't go through an official human-style marriage ceremony, but the principles still apply. The episode is even called "The Doctor's Wife"! Pairing him with Derpy makes no sense!
I hear there's a problem with this in the Naruto fanbase. I barely know anything about the series, but I have seen that pairing Naruto up with... some black-haired guy. (Was his name "Saske" or was that the name of his white-haired mentor with the hypno eye? I told you I'm not a fan, so I don't have all this stuff memorized.) Apparently, that is "the most popular fan-pairing ever", and one of those that's gotten so big that people mention and reference it like it's fact.
There are some out there for satire that exist to make you laugh at this absurd concept, such as Blaze the Cat paired up with Doctor Eggman or Link paired up with a nameless redead. That I can appreciate. I love me some good satire.
Probably the biggest of these is "Knuckles and Rouge". They're enemies. They hate each other. They've hated each other since Rouge debuted in Sonic Adventure 2 and it hasn't lead up. Knuckles lives to guard the Master Emerald. Rouge wants to steal it for herself, even though it's what keeps Angel Island afloat in the sky. It makes no sense. It's like pairing an animal-lover with a poacher. It makes zero in the sense department.
There's also "Silver and Blaze". A Sonic Team executive already stated that Blaze's backstory was explained in Sonic Rush. Ignore Sonic '06. She had no reason to be in that game. Silver and Blaze have never met. Silver is from the future of Sonic's world and Blaze is from another dimension. They. Never. Met.
There's another one that came from that game, too. "Sonic and Elise". Yeah, that's in the actual game, so it's not a fan-pairing and it's treated much more as a joke. Except... the principle is still being used to this day. There are plenty of people (mostly girls... I hope) who like to pair Sonic up with THEMSELVES. Or Shadow. He's the second-most-likely to get sucked into this.
There's another fandom that gets some of the worst in this regard: The bronies.
There is an uncanny amount of fanfictions in which major characters (who are virtually always two females) just start having sex (sometimes in public) for no reason whatsoever! Seriously! Someone had once sent me a friend request somewhere whom I hadn't met, and I tend to verify what a person is like before I accept such things. So, I checked her profile, and she was praising the work she did on this fanfiction in which Applejack and Rarity start breaking into people's houses while they're still there and having sex for no reason.
Another that at least has members of opposing genders is "Doctor Whooves and Derpy Hooves". This falls under the "One of them is already married" category. In an episode of Doctor Who, we see that The Doctor is pretty much married to the TARDIS, who is shown to be an actual living being and even takes on a humanoid form for most of the episode. The Doctor is in love with her and clearly shows it. It's not even subtle. He doesn't go through an official human-style marriage ceremony, but the principles still apply. The episode is even called "The Doctor's Wife"! Pairing him with Derpy makes no sense!
I hear there's a problem with this in the Naruto fanbase. I barely know anything about the series, but I have seen that pairing Naruto up with... some black-haired guy. (Was his name "Saske" or was that the name of his white-haired mentor with the hypno eye? I told you I'm not a fan, so I don't have all this stuff memorized.) Apparently, that is "the most popular fan-pairing ever", and one of those that's gotten so big that people mention and reference it like it's fact.
There are some out there for satire that exist to make you laugh at this absurd concept, such as Blaze the Cat paired up with Doctor Eggman or Link paired up with a nameless redead. That I can appreciate. I love me some good satire.