Under Garp's instruction, Koby's timidity has been replaced with confidence, although he remains polite, self-effacing, and apologetic if he feels he has done something overly ambitious. He continues to be an emotional, compassionate person who can easily be driven to tears. Koby has an immense amount of determination. Due to his harsh training regimen under Garp as well as further gruesome training, Koby has developed superhuman physical prowess and attributes, such as strength and speed. 