Looking at it, the only real similarities between Excalibur and my idea are that they both have magic swords and an armoured form, although mine is more than capable of fighting unarmoured and usually saves that for any tougher enemies she might face. The main gist of the ideas I had were that she was a legacy hero (there have been several like her in the past, and she is only the latest to take on the title and responsibilities she bears), her major motif was Lovecraftian stuff and... I guess she was veering a little bit towards being something of a cross between Dr. Strange (only less powerful and with more defined limits to her powers and abilities; this was also part of the reason I wanted to go with the library idea) and the hero of a Japanese live-action show called Garo.

I really did like this idea and I really hope I can work it out. It's just taking me a little while because I like to take my time writing up characters to ensure I get the best possible results, I guess. ^^;