It could be that the cartoon kid has trouble making friends or is dealing with a loss. These kinds of things can make a kid feel depressed.
Depressed kids in cartoons are often shown as quiet, withdrawn, and lacking energy.
The empty chair could symbolize a sense of loneliness or the absence of someone important in the kid's life.
The theme could be about the kid's struggle to overcome depression and find hope. It might focus on their internal journey and the people or events that help them.
The cartoon boy could be depressed because he lost a competition or failed to achieve a goal he set for himself. Or perhaps he's feeling lonely and has no real friends to talk to.
There could be various reasons. It could be that he lost something important to him, or he's feeling alone and unappreciated. Maybe he's dealing with some inner conflicts that are weighing him down.
Maybe the knight faced a series of failures or setbacks that made him feel down.
The popularity could be because it evokes empathy. People are drawn to stories or images that touch on deep feelings, and a depressed dog can do that. Also, it might offer a unique perspective on mental health in an unexpected way.
It could be through using irony or self-deprecating humor. Sometimes showing the absurdity of depression in a cartoonish way can bring out unexpected laughs.
Maybe it's because of its bad experiences or a lack of love and care in its life.
Maybe the dog had a bad experience or didn't get what it wanted. That could make it feel down.