I completely adores how Aozora Market depiction of the Scarlet sisters. Remilia fits perfectly the notion I have of her while Flan comes pretty damn close. Plus, the drawing of them are pretty good. Special props to Scarlet and Scarlet doujin.
I also like Tohonifun's Reimu, with her "apathy bordering disdain" attitude. Yuka is also nice
Kagero has my favorite interpretation of the Moriya Family, particularly in the doujin Kochiya-ke
Water Cushion's Kaguya and Eirin won my heart, although that Kaguya lacks a little insanity.
Either Advent Cirno or Because Cirno-chan is the Strongest win Cirno for me.
Akatsuki Dou's China also rules, although more her attitude than her back story. I don't want her to be nearly stronger than Remilia
Then there' Teddy-Plaza's Yukari in Tenkomori
And more I cannot find... oh, Marisa Alpha and Omega by Demour 402... at least physically