[@TheWindel] Artoria existed because:

A. I saw a cute wolf girl pic and went "MUST MAKE CHARACTER".
B. Megamanning was my way of "Maybe it's just my power choices that are screwing me over. If I make a character who can copy GM character powers, with that still being Artoria's thing so not just anyone could do it, maybe I'll be relevant and unique!"
C. Turning people into cute animal girls was fun to see all their pride hurt!

That lead to:

a. Being a cute wolf girl was fun. Moon out of Moon, would wolf again.
b. Any power of a tier that would actually allow Artoria to be more than a pawn was off-limits. And Hohenheim totally could make another one of her if she wanted to. Nothing about Artoria was unique.
c. While a fun gag, it really wouldn't be a good idea to force people to do in the long run.

Given these taken together, I might make another woof someday, but I was fine with Artoria being used as a test to determine how the GMs would handle someone finally calling them on "Yes, my character will stay past the warnings, and contest their will against your character".