Kazuichi Soda is the Ultimate Mechanic, who wears his emotions on his sleeve, whether he wants to or not. Despite attempting to act calm and collected, he's often the first to completely lose it in stressful situations. People often note that his appearance does not at all match his compulsive, cowardly personality. He's quick to blurt out his thoughts, without filtering himself, or thinking things through. This can lead to a lot of trouble, especially when it involves his feelings towards Sonia Nevermind.

Kazuichi's voice is in a mid range, with a laid-back tone.