Genos is an extremely serious character, rarely if ever making jokes. He constantly aims to become stronger. On occasion, Genos acts as a comic foil to his mentor's clueless antics. Genos envies and reveres his mentor, although this does not stop him from expressing annoyance and disbelief at the mundane training regimen they used to gain their powers. Genos is an intense person, unyielding in his pursuits. Genos was also a serious person before he became a cyborg.