When ZUN was once commenting on Kana's theme, he said that before drawing Kana, he always noted that she is "An European girl who destroys things while holding a road sign behind her back" (from Phantasmagoria of Dim. Dream Th3_08Pmd.txt). It is common to find Kana Anaberal holding a road sign or attacking somebody with it in fan art.
Her creator, a mentally unstable girl, has been shown in fan works more often. Common names for her are Honey, Rumiko, and even Yuuka. It's also speculated that Flandre Scarlet could have created her, but that, of course, isn't true.