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Unless you are making a story which is the equivalent of "gen" Fan Fic, you will have a main character who falls in love with one or more people, or vice versa.
Stereotypes: some character lists in bishoujo and otome games can seem like checklists of fan-favorite character types.
Note that harems do not necessarily exist in doujin visual novels.
Likewise, many commercial games have a Slice of Life setting.
Instead, write a few scenes, or get some of your gameplay to work.
Then set a realistic deadline for yourself, and don't change it.
Note that Featureless Protagonist is exception to this.