Klaus Barry Heterodyne

Klaus Barry Heterodyne was born in (mumblemumble)72 to Lucrezia Mongfish Heterodyne and Bill Heterodyne. He was named after, first, his father's best friend Baron Klaus Wulfenbach, who had disappeared two years and three months before the child's birth; and second, his uncle, Barry Heterodyne.

He was killed by debris fall when he was only 407 days old during an attack on Castle Heterodyne, at which time his mother vanished mysteriously.

His younger sister is Agatha Heterodyne, although she did not find this out until she was eighteen.