A policeman on the trail of the Befort Children. Cooks is supposed to be investigating the case of the missing child, Flow (Soreto), but he notices that the photos of Flow, and several other children who went missing at the same time, bear a striking resemblance to a photo his grandfather took of the Befort Children 100 years ago. He does run into the children several times but they are unresponsive to his questions; when he meets them in the GED organization's lab he starts trying to spy on Gherta and her team as well.   (Source: Wikipedia) 

A group of enigmatic white-haired children has been spotted at different times and places in Europe for over 500 years. Always with the appearance of 11-year-olds, they behave far more mature than they should be, never grow old, and seem to have supernatural power. What they have been seeking is a girl, and the only clue they have is a picture with a crescent moon. Now, in the year of 2012, an athletic boy named Tohma is about to be involved in this centuries-long mystery.
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(Source: Anime News Network)

[Wiki (jp)](https://ja.wikipedia.org/wiki/辻親八)

Olivier Cuvellier (sometimes spelled Cuvelier) is a Belgian theater actor   who also did dubbing for movies and series.