One main theme could be the duality of emotions. We have the gladness represented by one monster and sadness by the other.
The 'glad monster sad monster story' is likely about two different monsters, one that is happy (glad) and one that is sad. Maybe it shows their different daily experiences or how they interact with the world around them.
One possible theme could be the concept of the unknown. Since it's about a monster in an unbirth state, there's a lot of mystery surrounding it. Another theme might be fear, as the idea of a monster, even in an unbirth state, can be quite frightening.
I think transformation is also a theme. The relationship in 'Monster a Love Story' likely transforms both characters. The monster might become more 'human' in a sense, and the human might change their view of the world and what they find acceptable in a partner. There could also be a theme of isolation. Maybe the monster was isolated before the love story began, and the relationship breaks that isolation.
Another theme could be the power of money. The money monster could represent how money can have a controlling and sometimes menacing influence over people. It might show how people are willing to take risks or change their behavior in the face of financial gain. Also, there could be a theme of consequence. If the characters interact with the money monster in a negative way, they might face negative consequences like losing their integrity or getting into financial trouble.
Well, in the Frankenstein monster story, a big theme is alienation. The monster is alienated from everyone around him. He doesn't fit in, neither with humans nor with the world he was brought into. Another important theme is moral responsibility. Frankenstein has a moral obligation towards his creation, but he fails to fulfill it. And there's also the theme of the power of creation, showing how a new form of life can have unforeseen consequences.
Perhaps Constance is a misunderstood monster in the house. The sad story might be that no one ever tried to understand it, and it was always feared and shunned. This led to a cycle of loneliness and sadness for the monster, and the house became a place full of melancholy.
The themes include identity. The main character is trying to figure out who he is in the face of being labeled a monster. It also deals with the theme of race. As a young black man in the justice system, his race plays a role in how he is perceived and treated.
One main theme is the danger of overreaching. Victor Frankenstein's attempt to create life goes horribly wrong, showing that humans should not play God. Another theme is isolation. The monster is shunned by society and becomes bitter due to his loneliness.
The themes include the consequences of unethical scientific experiments. Victor's creation of the monster without considering the moral implications brings disaster. Loneliness is a big theme too. The monster, being rejected everywhere, turns bitter. And the theme of nature vs. nurture is present. Is the monster born evil because of how he was created, or does society's treatment make him so?
One main theme is the battle between good and evil. The'monster' represents the evil force, while the'men' often symbolize the forces of good trying to combat it. Another theme could be justice, as the men may be seeking justice against the monster.