He has a mischievous side as well, as shown by the jokes he plays on Norito with a straight face, such as phoning Norito from a hotel during his journey to South Korea and assuming the name of 'IGARASHI' (it is not known if he assumed the name of Ichisuke or Yoichi).
一方で茶目っ気があり、旅先（韓国）のホテルから憲人に「五十嵐（市祐か陽一かは不明）」の名を騙って電話するなど、真顔で憲人をからかうところがある。