[quote=Raineh Daze]
Any player-made version of Arthur would suck in comparison.
[/quote]
Why must they be compared? Why so, if the player is happy with their version what would be the problem? If how powerful they are is a problem, it seems they'd be just as powerful as any OC. I don't see a problem here. 

You could easily make Arthur with a Noble Phantasm like Carnwennan the dagger of King Arthur in the Welsh Arthurian legends. It's attributed with the magical power to shroud its user in shadow. That could easily be helpful for a servant as recognizable as Arthur. 

My apologies, I'm not trying to make this into any kind of argument, truly I'm not.