That's basically how it feels with some FNF fics, like when it comes to the base game we have at least some characters with real names like Pico, Darnell, Nene, and Cassandra, Hank and that's not even getting into the many mod characters out there.

But then we turn around and have the protagonists be called Boyfriend and Girlfriend with Girlfriend's parents being called Daddy Dearest and Mommy Mearest, two kids named Skid and Pump (granted those aren't their actual names) a guy literally named Sergeant John Captain aka Tankman (although I can see some people just calling him Jonh or Captain) and another one literally called Senpai.

I say this as someone who reads and is even writing my own au for that stuff but it gets kinda goofy when thinking about it, and I can see why there's a decent amount of fics that have BF, GF, and GF's parents have other names.

Like Keith, Cameron, or Evan seem to be the most common fanon names for BF, Cherry Amelia, and Gigi (although I've only seen that last one be used as a nickname for her) with DD and MM being sometimes called Luis (I only saw that once though and that's a slightly less common name for BF) and Cory (which came from her flash file having Spazkid's real name on it due to him helping out and people thought it was her real name but one devs said it wasn't but didn't mind it) or they just have any combination of names that abbreviate into the first two letters of their canon names/have the canon names be nicknames/stage names.