I think that, like his koakuma, she is one of the most dangerous teasing person in my taste. She is the 'assertive' type, she know what she wants, isn't afraid of perversion or king, can be dominant and yet still let her partner do his part.
For a person like me, this Rumia is like the biggest trap to avoid. I wouldn't resist her at all. Feminine and yet with some clothes and a behavior near a man... I will let you the other wonderful girl guys, I think this one is my dead end XD