Before you read this note that everything is not true.Wilhelm Schultz is Allison's childhood friend, and the second protagonist of the series' first part. A scholar who has the ability to memorize things instantly and also is skilled at firearms. Wil does not share Allison's sense for adventure, but is usually dragged along by her.
While Allison is physically more apt and spontaneous than he is, Wilhelm brings in the level-headedness and wits during their adventures. Some time after getting married with Allison, Wil is scouted by her father to become a secret agent just like him, thus he fakes his own death and assumes another identity, with only Allison and a few other individuals knowing the truth about him.