One possible theme could be education, given it's about a school.
I'm sorry, I haven't read 'arkady gaidar school and other stories' specifically, so I can't give a detailed introduction. But generally, it might be about a school named after Arkady Gaidar and other related tales.
Another theme could be power. If the artificial man has certain abilities, there might be a power struggle between it and humans, or among different groups who want to control the artificial man. This can lead to all sorts of conflicts and moral questions about who should have power over such a creation. And it's also possible that the stories explore the theme of isolation. The artificial man, being different from others, may face isolation, and how it copes with that could be a central part of the story.
Another theme could be the passage of time and how it affects the relationship with the father. As time passes, the understanding of the father, the memories, and the impact of his actions can change. Also, themes of forgiveness and redemption might be present. If there are any wrongdoings within the family related to the father, the stories could explore how characters deal with forgiving or being redeemed in the name of the father.
One possible theme could be survival. Given the name 'First Blood', it might involve characters facing challenges right from the start, and survival could be a key aspect throughout the stories. Another theme could be exploration, as they might be exploring new places or situations. Also, the theme of self - discovery is likely, as characters deal with the events that unfold.
The themes in 'the kept woman and other stories' could be quite diverse. Dependency is likely a theme, especially considering the idea of a 'kept woman'. She depends on someone for her livelihood and in that, there are many aspects to explore. Another theme could be moral conflict. Is her situation morally right or wrong? And the theme of change could also be there. How do the characters, including the kept woman, change over time in response to their situations? And of course, other stories may expand on these themes or introduce new ones related to human nature and relationships.
One possible theme could be change. As time passes and places change, the characters in the stories might experience personal growth or decline. Another theme could be the impact of environment. The place can greatly affect how the characters live and interact.
One possible theme could be change. Since there's an 'end of the game', it might imply a change in a situation. Another theme could be loss, as the end of something often involves losing a state or a relationship.
One possible theme could be the fear of the unknown. Dark stories often play on our fears of what we don't understand.
Friendship is an obvious possible theme. It could explore how two friends support each other, trust each other, and the bond between them. Another theme might be adventure if the two friends go on various escapades. Also, loyalty, as they might face situations that test their loyalty to one another.
Another possible theme is academic achievement and the struggles students face to get good grades. It could also be about the relationships between teachers and students, like a strict teacher who has a positive impact on a student's life.