Emiko is Daisuke Niwa
's mother. She is extremely hyperactive
and does not act her age. She makes unusual clothing for Dark
when he goes out to steal artwork. She is also responsible for sending out the notices to the police
that tell them what, when, and where Dark's next target will be. Emiko is very much in love with her husband, Daisuke's father
. It made her very upset as a young girl that she could not become Dark Mousy. She would beg and plead him to come out and
be with her as he does with Daisuke, but he would never appear.
Emiko and her father rig the house to be a training ground for Daisuke. She has a very peppy personality, and views Daisuke’s
transformation as cute. On the surface, it seems that she doesn’t feel Daisuke’s pain, but inside she feels for
her son and promises to watch over him.