The character design is quite simple and drawn in such an illustrative style that it suits the younger target market that the program channel Cartoon Network aim for; The use of the dark narrative works well with the illustrative style that is mixed with a victorian fashion.
The personality of the older brother Wirt is portrayed through his facial expression and demeanour with a slouched posture and lowered shoulders to depict his gloomy and stubbon moods. The facial expressions are quite exaggerated with the movement of the mouth with decreasing in size or increasing to the point it fills most of his lower face, pupils extremely smaller to show shock etc. Wirt's body language highly effects the tone of mood that he is engulfed with, throughout the narrative he is quite anxious of the new characters that he meets, a hunched posture and closed off from people by keeping his arms wrapped around himself or taking a step back. Whereas Greg is always optimistic, which changes Wirt's attitude by taking a straight posture, becoming more confident seen in his dramatic movements with his arms or moving his hat, and walking with a slight bounce, a 'skip in his step' as he helps different characters. In some cases with his body language it is exaggerated through the use of his joints in his arms in which remind me slightly of adventure time through how they can wave compared to the movement in a more realistic arm.
The younger brother 'Greg' holds a happy outlook portrayed in both his body language and his facial expressions as he wonders to the next adventure with the world as they search for a way home. With Gregs attitude the solution to the episodes problems are unlikely solved with an action that he accidentally does. He often spins and dances, exaggerating the width of his steps and skipping slightly with his arms outstretched which works well with his happy facial expressions, creating a happy go lucky demeanour.