If I recall correctly, some sources claimed she also borrows from Nadja (Secret of Blue Water)^^
But then again, this is really just too obvious. She's such an Lookalike you could use her as a Reference/Stand-In for Fanart of an older, matured Mercury! No, seriously, she even has that single Ahoge ('Idiot Lock') at the top of her head!
P. S.: Geez... Is there ANY Screenshot of that Anime available which does NOT censor the 'Naughty Bits'?
I remember watching that show all the time as a kid, but I honestly have no recollection of having ever seen those segments on the show, and I for sure would have remembered watching a part of the show like that.