Typically, power struggle could be a main theme. Concubines often had to navigate the complex power dynamics in the imperial court or wealthy households. Another theme might be love and jealousy. There could be intense emotional rivalries among concubines for the affection of the master.
One main theme is love and sacrifice. Concubines may fall in love with someone, but due to their status, they often have to sacrifice their feelings for various reasons.
Gender reversal is a main theme. Since the concubine is a man, it turns the traditional concubine - a typically female role - on its head and challenges our expectations of gender roles in that kind of relationship.
Love and jealousy are also themes. They may fall in love with the master or other people, and jealousy can arise among them. In 'The Plum in the Golden Vase', the relationships between the concubines are full of love and jealousy.
The themes in 'Farewell My Concubine Novel' include identity. The characters struggle with their own identities in the changing times. Also, the theme of sacrifice is present as characters make sacrifices for love and friendship.
Love and betrayal. There are likely love interests in the novel, but also the threat of betrayal from those around her.
Love is also a theme. She may form relationships with other characters, and her psychic powers can influence these relationships, whether it's romantic love or friendships within the court. It's about how her powers interact with her emotional connections.
Power struggle. In the imperial court, everyone is vying for power, and the concubine is also involved in this.
The struggle for survival. A concubine's position can be precarious. She has to rely on her beauty, her wits, and her ability to navigate the complex politics of the court or the harem. If she fails, she may face a very difficult future, so the theme of survival in such a cut - throat environment would be important in the novel.
I'm not sure about the exact main themes of this novel without having read it. But many Chinese novels often deal with themes like family values, loyalty, and the struggle against adversity.
One of the main themes is resilience. The protagonist often faces hardships and discrimination but still manages to persevere. Another theme is the search for identity. Growing up in a difficult family situation, she tries to figure out who she really is.