One of the main themes is grief. The characters in the bardo are all dealing with their own forms of loss and unfulfilled desires. Another theme is the idea of transition and the afterlife. It explores what might happen to souls in the in - between state. And also, it touches on the theme of father - son relationship, as Lincoln's relationship with his son is a significant part of the story.
As a fan of web novels, I don't have any knowledge about the plot and character settings of Star Travels. Therefore, he had no choice. It is recommended to read the original work or check the relevant background information to obtain more accurate information.
Well, the themes include the exploration of the human condition. In 'Lincoln in the Bardo', we see characters in a sort of limbo, and this reflects on how humans face uncertainty and change. The historical aspect of it also brings out themes of war and its impact on society. And of course, the relationship between the living and the dead is a significant theme, as Lincoln is mourning his son while the other characters in the bardo are in their own state of waiting and reflection.
I think it might mean that there's a caricature of a gentleman who is a legionnaire and is in a fight. But this is just a guess based on the words. To understand it better, we'd need more background information.
Since I'm not familiar with the 'Monster Dia and Meg story', it could potentially be a story about friendship between two monsters. Maybe Dia is big and strong while Meg is small and clever. They might go on a journey to save their monster homeland from some kind of threat, like an evil wizard or a natural disaster that is endangering their kind. However, this is all just speculation without more context.