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To add something useful to the conversation, I guess, here's something about how tags can affect perception of a story.
Let's say, THEORETICALLY, there's a fic in which a character appears to be a ghost haunting a house. From the beginning. The tags are: MCD, ghost character. 
A reader looks at them, looks at the first chapter, and goes, welp, he's dead chief. And either proceeds or not. BUT
A reader looks at them, looks at the first chapter, and goes, welp, he's dead chief. And either proceeds or not. BUT
if neither MCD nor ghosts are tagged, a reader will likely read the first chapter and think, huh. There are no death and ghosts in the tags, so something else must be at play here (the character is in a coma, or in a parallel dimension- but not dead) that will be revealed later.
Because that's how major, basic tags work. That's the logic. These tags are in place for a reason, and yes, they include relationship tags, not just major character death that I used as an example. I hope this explanation is helpful.
