When looking into animated characters with a melancholy personality the first character that came to mind was Eeyore, the gloomy, depressed stuffed donkey from Winnie-the-Poo. This character could influence my melancholy step ladder by his posture and manner in which he moves. Eeyore is presented as being depressed by his slouched posture and his limbs, ears and even eyes being droopy.
Tex Avery's 'Droopy' is another character which shows the traits associated with a melancholy personality. Droopy's name comes from the obvious droopy face associated with a basset hound dog which express sadness.