Ikuto normally cuts a lackadaisical figure, talking casually with those above him such as Togo Shiba or Azami as well as with fellow members of his squad, but can instantly grow serious when the moment requires it, such as when he was fighting Genichi Sojo. Even in dire combat situations, his less serious side can come out at times, Ikuto mocking Sojo twice during their battle in the skies. However, he rapidly lost his composure after Sojo landed devastating blows on his comrades Kugara and Makoto, being incredibly shocked by Sojo's increase in strength and frantically calling out for Kazane to activate his sorcery.  
Voice Reference: Shizuo Heiwajima - Durarara https://www.youtube.com/watch?v=oVLmdM7hKuo