Carbuncle is a rather jolly character, often seen with a big grin on his face and has a tendancy to goof off. However, on occasion he's shown to be quite mischievous, randomly snagging objects or running off on his own. Even during combat he tends to ignore the situation at hand to goof around, making him somewhat unreliable. While normally being depicted as being rather jolly, on rare occasions he may be surprisingly serious, for example giving Satan a rather cold stare.