I have a certain set of names I typically use... Regardless if it's the protagonist or other characters... Although sometimes the character names will vary from time to time... The protagonist name I use is gender neutral, as you are not always clued in as to the gender of the protagonist before being asked for a name...
Problem is, not all VN/Games handle custom names very well... Especially when you get the option to, not only name other characters, but to set the actual word that describe the relationship... 9.5 times out of 10 the story and dialogue is setup for an Incest theme originally, with an option to either select the default conversion name (landlady/landlord and roommates), or go with a custom one... But then when the text actually plays out, the default conversion name and/or custom name doesn't fit properly, and ends up either sounding weird or makes no sense... When the story elements are not originally meant to be Incest themed, then it's a crapshoot as to how it's going to sound, depending on your title choices...
Now I just automatically assume if there is an option for relationship titles, that the VN/Game in question is just poorly converting from an Incest theme in order to skate around the rules for sites like Patreon and others like it... And a majority of the time it feels lazily implemented and is actually detrimental to the overall product... If they really want to not be an Incest themed VN/Game, then start from scratch and make it that way... It's just lazy development at that point, because it rarely reads right, even with default landlord/landlady and roommate as the relationship titles...
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