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I'd argue Celica and Lyn fit, mainly because there was no way of knowing they wouldn't be in the story prior to the game coming out. Since they are in the game, but not at all in the story, it does seem like they got shafted. That's my opinion anyway.
Muramasa got.
I would go against since they aren't in the main campaign and don't have any interaction with the cast.
^ They do interact with the main cast, but only in support conversations and in-battle dialogue. I would still say that they shouldn't be included in They Wasted a Perfectly Good Character because they were never meant to be in Story Mode, and trying to put them into They Wasted a Perfectly Good Character would just end up being complaining.
The story is pretty pedestrian, so it's not like they'd contribute anything of value if they were present.
I don't think they count. All the meat of the writing is in the Supports and battle dialogue, which they both got to participate in.
If a tree falls in the forest and nobody remembers it, who else will you have ice cream with?
We're having a discussion in Fire Emblem Warriors about the inclusion of two characters who are Advertised Extras, but not available in the game until after clearing the main story. Much like That One Level or That One Boss, is They Wasted a Perfectly Good Character even allowed for characters introduced outside of the main story?