A love of the odd, a bit of contrariness, and probably a dash of boredom gave life to Jhaelryn, the tiefling paladin. While her solid black eyes are clear testament to her fiendish ancestry, Jhaelryn made a very conscious break with her past in taking up arms not merely against forces of evil, but in particular against the demonic hordes which spawned her. Her lack of a surname was also a deliberate choice of hers, representing her unfulfilled quest to find and likely destroy the man who passed on his hellish features to her. And, yes, that is a double-bladed sword she wields. I don't see them show up in artwork, and depicting this particular one was one of the original purposes of creating this picture.