Bad Boy is an angsty, rebellious and moody sixteen year old boy. He is a loner who despises being around people he deems annoying or stupid. Unfortunately, the majority of the Len modules qualify for these attributes in his opinion. Because of this, he is rarely seen outside of his room. Unbeknownst to the others, Bad Boy has a popular Tumblr blog on which he posts rants and cute illustrations of animals. Despite his stand-offish attitude, there are a few modules that the blonde gets along with. He and Blue Moon formed a small band with Black Star (Rin module) in which Blue Moon is the guitarist, Bad Boy is the drummer and Black Star is the vocalist. According to rumors, they are searching for a bassist. Bad Boy also enjoys spending time with Stylish Energy L, who also goes by Energy. It's a mystery to everyone why this is, as the younger boy is to many the exact definition of irritating. Nonetheless, the platinum blonde seems to find Energy endearing, but will deny it when questioned. Bad Boy is the younger brother of General (Kaito module) and Agitation (Miku module). He does not get along with these two very well. He is constantly avoiding them and refuses to speak with them unless absolutely necessary. According to some, he had even referred to General as a pushover and doormat for constantly putting up with Agitation, who he abhors for calling him "emo". Despite his mean demeanor, Bad Boy is a good person at heart and doesn't have bad intentions at all. He is just going through a rough phase in life.