Grassy appears to be quite childish and joyful, as he supposedly enjoys funny doings, much like Blocky. He usually talks in the third person point of view, often saying his name when referring to himself. He isn't afraid of sharing his feelings, like when he told Blocky that he wanted more respect from his team, mainly Golf Ball. He also considers himself to be useful. These facts seem to show that he has rather high self-esteem, but not quite to the point of being arrogant or egotistical.