Othar Tryggvassen (Gentleman Adventurer) is a self-described hero determined to 'save' the world from Sparks by killing every single one of them, including, eventually, himself. For whatever reason, he seems to consider Heterodynes exempt from the All Sparks Must Die rule, at least temporarily, possibly due to the exploits of the Heterodyne Boys. He is very hot on the idea of Agatha Heterodyne becoming his new spunky girl sidekick. She herself is rather less enthusiastic.