Jonathan D. Pucci has pale skin, white short hair, and yellow eyes. He wears a long green coat with a large collar and green suit with a white shirt under his suit. Together with this, he wears a green tie with a yellow round tie clip.
Since his early childhood, Jonathan was very independent and self-confident, at times even appearing arrogant and condescending. Despite that, Jonathan was very perceptive and intuitive, quickly realizing the situation for what it was. After his father's death, Jonathan became more stern and cold toward others, following all the rules to the letter, chastising any who disobeyed them, and being willing to abandon his friends for the sake of his company.
As an adult, Jonathan typically has a relaxed and almost bored attitude, not prone to getting too worked up about anything or by anyone. Despite his increasingly growing reputation as a businessman, Jonathan has shown no signs of arrogance and is rather modest. He is habitually tardy, showing up when it suits him and only carrying for his company and not others. Though Jonathan wants others to believe this is how he always acts, he only does so for matters that aren't of any importance.