Before I go through every Singularity again, I thought we could make somewhat of a list here, of Servants that exist, are playable, but never really appeared in the main storyline.
To give you an example of what I’m talking about: Cleopatra
So far I think we’ve only seen her in the Halloween-Events.
Another one would be Cu Prototype. I can’t remember ever seeing this guy anywhere. No events, definitely not the main story, he only spoke to me once during his own interlude.
I guess the same actually goes for Proto Arthur, but at least he had his Trial Quest.
At least these two have the excuse of being from other Fate/-works, but still.
So what other Servants, FGO-originals or not, can you think of that never had a spot in the main story (but really would love to see there)?