Deruko Honne is Dell Honne's twin sister.
Personality
Deruko is a female, but acts like a boy. She teases Dell by calling him names and fighting over the computer with him. Deruko is a very aggressive girl that always yells at people but she does have some feelings for Dell despite the fact that he is her brother. She may be mistaken to be Yowane Haku, but they are not related whatsoever.
Here is an example of her voice: