Beneath his facade of simplicity, Kira is very abnormal. The most abnormal characteristic of Kira his fetish for the female hand, stemming from an erotic fascination with the hands of the Mona Lisa. However, his desire has never extended to the rest of the female person; in fact, when on a normal date, all he could think about was how much he wanted to go home. This results in murdering women in order to acquire their (severed) hands as “girlfriends”; when one “girlfriend” begins to decay, he goes off in search of a replacement. He measures and collects his own fingernail clippings, using them to divine his murdering luck off of their length.