Awww! Thanks so much for linking my novel! I really appreciate it! <3 I feel so warm and included.
Main theme: Inheritance is very much a novel about nature vs. nurture. Eory was born thinking evil thoughts and it's only due to environmental factors that he can actively fight them. A lot of the other characters in the book are suffering from the same problem. For example, Kori was born sort of naive, trusting, and overly kind, and she has to overcome this to realize that not everyone is going to be her friend. XD
Sub-theme 1:There's a big theme about being chained to things that are not physical in nature (like being chained to ideologies, gender, biology and stuff) as well as many of the characters physically being in chains.
Sub-theme 2: There's another theme of walking a fine line between kindness and naivety, and strength and cruelty, and trying to find the correct area to stand in in-between.
Sub-theme 3: There's also more of cliched theme of lost innocence. XD At some point in their lives (excluding the Arrozan Royal Family), most of the characters in the book were just normal people, but some of them were pushed over the edge due to cruel past incidents.