It is a little bit difficult for me to understand the definition of the soul in the way that is understood by the people who have Christianity background. For me souls are something that are in the animals including human beings. I guess this was the same idea that people in ancient Rome had, because the word for 'soul' in Latin is 'anima' and from this the word 'animal (living creature)' had been derived. However, apparently the concept had been changed with time and the word soul is started to be used to differentiate humans from other creatures.
It, relatively, makes sense to distinguish human beings and other animals by whether to laugh or not. I have never seen any creatures laugh like humans except apes(Chimps, Other Apes Laugh Like People.). I am impressed how people could notice the difference between them. Also, the person that I have talked told me an interesting story about a debate over whether native Americans have souls or not, during the Age of Exploration (Juan GinĂ©s de SepĂșlveda (1547) - Digital History).
I assume that for a religion such as Christianity, they needed to categorise humans into a different group to teach people about morals, because, to me, animals do not really have a rational mind to control their behaviour.
This, soul, is a quite interesting concept, so I would love to study more when I have time.
The top picture is a game package for Akuma-kun which was the originally a comic by Shigeru Mizuki. The boy in the middle with a card is the main character, Akuma-kun. A man next to him who is in a suit, is Mefist II. To my surprise, there is a character called Doctor Faust II. He is the old man with lots of white hair with a green cloak. He is the principal of the Mienai Gakkou (Invisible School).
I remember the theme song of this animation and believe that I used to watch this, however, the stories seem so new to me and interesting. I would love to watch this again and see what kind of features had been adopted from the original 'Faust'.