Gaius is calm and collected, with a clear mind. However, his seriousness breaks whenever candy and other sweet confections are brought into the question. Despite the nature of his job, Gaius has morals and does things with the best interest of others, such as his unwillingness to assassinate Emmeryn because he likes her, or blaming Maribelle's father for his theft incident to protect Maribelle.

Gaius has a very sly and chill way of speaking.