Artoria Pendragon (Saber)

Before you guys ask what I mean, I mean like WHAT she is? A young version or "Pure" version of Artoria, because I swear Im getting confused bc on one hand, I find info saying she is younger Artoria but on other hand, finding ones that say she is "Pure" version of Artoria, to the point Im confused.

Yes I know she was at first just a costume for one of those Fate games and etc. but Im just so generally confuse and Im pretty sure a few others are too.

Which characters who were stronger when they were alive do you think are nerfed the most when summoned as a servant?

So as we know when ever a Servant is summoned the things they have, Noble Phantasms, skills, abilities and all that are limited by the class they are summoned in, the biggest example is how Artoria has Excalbur as a Saber and Rhongomyniad as a Lancer. But if she was summoned without the restrictions of a class container, and had all her things she would have:Excalbur, Rhongomyniad, Avalon, Invisible Air, Caliburn, Clarent(It was orginal her's), Prydwen and Secace. So my question who are some Servants that you want to see without class container restrictions and all their stuff?