This man is a scientist working for Marciano. He created the 12 Sisters and knows Marciano well, wondering if she regrets having Bruce killed. Nielsen gave the Sisters their clothes, sparking jokes in the fandom about his apparent gothic lolita fetish.    His name is also acceptably written as Nilson or Nielson, but there is no official statement or source that romanizes his name one way or the other

Mister is a "coyote" or space faring outlaw who has been sitting in prison for a year for a traffic offence. Ten days from release, he breaks out with the help of his old partners Bishop and Katana. He then seeks out Franka who has been left in his care by her dead father and takes her on a journey to find her father's treasure. On their heels are the federal investigators Angelica and Chelsea as well as the android assassins of the Criminal Guild, Madame Marciano's Twelve Sisters.
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(Source: Anime News Network)