I read almost all the Weinero fanfics that existed, some multiple times, so I decided to check the fanfics for the Nero tag. This was a bad idea.
There was a fanfic where the main pairing is Sefikura, but at first Cloud was in a relationship with Tifa, and Sephiroth with Nero the Sable. The writing style seemed interesting, the plot intriguing, all these moral torments of Cloud that he is cheating on Tifa with Sephiroth, and Sephiroth was kind of dating Nero at that time. But as soon as the author described Nero rudely and unpleasantly, who is already poorly present in the plot and, unlike Cloud and Tifa's sexual and dramatic relationship, Sephiroth did not have sexual or romantic relations with Nero, and in general, weird, and Nero turns out to be "despicable and hateful, and repulsive" according to the Sephiroth, and I just... could not read it further. I felt offended for Nero, he does not deserve such a shitty attitude and description. There's so much illogicality in this, like Sephiroth complimenting Cloud on how good and understanding he is, but by humiliating his partner, Nero, who he went on a date with. He didn't really know him, and he's already saying such humiliating things to make Cloud feel better? But then Cloud should also humiliate Tifa to make Sephiroth feel better, but that didn't happen.
Another fanfic with a different pairing also features Nero, who is brutally killed by being burned alive in a glass tube while he was calling Weiss... and all the characters are like, yeah, that's what he deserves, evil is destroyed, let's celebrate it.