Power might be one of the main themes. Since it's about a fallen monarch, the loss and reminiscence of power could be explored.
Since I'm not familiar with the exact content of this 'Monarch of Time' light novel, it could potentially have themes like time manipulation. Often in stories involving time as a central concept, themes of fate, causality, and the power to change or preserve history are explored.
The theme of self - discovery is likely present. As the character is a fallen master, they may be trying to figure out who they are now and what their purpose is. Also, the theme of friendship or alliances might be important. The fallen master may need to form relationships with others to achieve their goals or survive in their world. In addition, there could be a theme of overcoming adversity. The fallen master has clearly faced some kind of downfall, and the story may be about how they rise above it all.
The themes include survival in a new and often hostile world. Also, there is the theme of friendship and loyalty as the main character forms bonds with various characters in the story. And of course, there is the theme of self - discovery as he learns more about his new identity and abilities.
One of the main themes is probably redemption. The fallen knight might be seeking to redeem himself for past actions or mistakes.
Power and growth are also significant themes. The main character has to gain power to change the fate of the fallen family. There's also the theme of facing challenges. He has to deal with various obstacles in his regressed journey, which shows his struggle and the will to overcome difficulties.
I'm sorry I haven't come across specific reviews for it yet. You could try looking on some major book review websites like Goodreads.
Since I don't know the specific 'monarch light novel', it's hard to say. But usually, the main character would be the monarch. There might also be advisors, generals, or a love interest.
One common theme is redemption. The fallen hero often has to find a way to make up for their past mistakes or misdeeds. Another theme is the loss of innocence. They have typically gone through some kind of trauma or made a bad choice that led them to fall from grace. Moral ambiguity is also a big one, as they may not be completely good or bad anymore.
Redemption is another key theme. The 'fallen woman' may strive to regain her place in society or find spiritual salvation. She might go through a journey of self - discovery and change, trying to atone for her past mistakes.
I'm not entirely sure as there could be many 'monarch' light novels. It might be about a powerful monarch's journey, like his rise to power, the challenges he faces in ruling a kingdom, and the political intrigue and battles involved.