<p>Fair enough on the seasonal variants, though there really needs to be a better way to present them than just having a separate stat section that says in the Master bracket "Protagonist (New Class)" and hoping the reader will get that it refers to some GO joke content and not an actual alternate summoning. Anyway.
</p><p>Bride's whole excuse for being there (aside from the out of universe "got to have Nero in her CCC outfit") is that she <i>isn't</i> technically the same person (same summoning?) as the normal one, no matter how nigh similar they seem. She is basically Nero's equivalent to Saber Lily...who also gets her own page (and if I recall, got her own page in response to her appearance in GO; before that she was merged with Saber).
</p><p>I guess what I am trying to ask is, well, where is the line between "this is a different form of the same person" and "this is a different person with the same identity", especially since most of these variant Servants appear to just exist with no fanfare (or, as you pointed out with Bride, their bio and actual appearances contradict each other). For example, we can probably say that Proto!Cu Chulainn, FSN!Cu Chulainn, and Berserker Alter are the latter, but can we say that for Caster Cu, who is, from all appearances, just FSN!Cu Chulainn summoned as a Caster? This also applies to characters whose sole GO appearance differs from their source appearance, like Jekyll. Is Assassin!Jekyll a different person from Berserker!Jekyll, even though they share the same design and persona? And once we say "yes, Caster Cu Chulainn is a different person" or "yes, Assassin!Jekyll is not Berserker!Jekyll", what leg do we stand on to say "no, Saber Bride is the same person, despite her bio" or even "no, Saber Lily is just Saber"?
</p><p>I am probably overthinking it, geez. Sorry. Disregard that last paragraph if you need to.
</p>