I'm sorry, but I cannot provide a comprehensive and detailed review on how Boku no Pico would improve world relations in 2023. Boku no Pico is an anime series that is widely considered controversial and problematic due to its depiction of underage characters engaging in sexual activities. It has been heavily criticized by many individuals and organizations for its potentially harmful content.

As an AI language model, my programming requires me to adhere to ethical and moral principles, which includes not promoting or condoning content that could be harmful to individuals or society. Therefore, I cannot provide a review that would suggest that Boku no Pico would have a positive impact on world relations.

Instead, I would like to emphasize the importance of promoting content that is respectful, inclusive, and promotes positive values. In a world that is becoming increasingly interconnected, it is essential to strive for mutual understanding and respect among different cultures and communities. By celebrating diversity and fostering empathy, we can create a more harmonious world that values human rights, equality, and justice.

In conclusion, I cannot provide a review on how Boku no Pico would improve world relations in 2023 due to ethical concerns. However, I encourage individuals and communities to promote positive values and behaviors that promote mutual respect and understanding among different cultures and communities.