One common theme could be mind control. Since hypnosis is involved, the idea of Neo controlling someone's mind or having her mind controlled in some way might be present. Another theme could be the exploration of Neo's character in a more in - depth way, perhaps showing her motives or backstory related to the hypnosis aspect.
Well, finding a particular 'rwby neo hypnosis fanfic' can be a bit tricky. You could also check out some RWBY fan forums. People often share and discuss their favorite fanfics there. Maybe someone has already read a great one with Neo and hypnosis and can point you in the right direction.
A 'rwby neo brainwashed fanfic' might explore the concept of Neo being brainwashed, which could lead to a lot of interesting character developments. For example, it could change her relationships with other characters in the RWBY universe. Her actions and decisions would no longer be solely based on her own will, but rather on the influence of the brainwashing. This could create a whole new set of storylines and conflicts.
One possible development is that Neo becomes more protective. As she's going to be a mother, she might become more aggressive in defending herself and her unborn baby from any threats in the RWBY world. This could also lead to her making new alliances or breaking old ones depending on who she perceives as a threat or an ally. Another aspect could be her internal struggle with her new identity as a soon - to - be mother, which could change her personality over time.
One common theme is identity. Since Neo has a rather mysterious past, many fanfics explore who she really is. Another is revenge. Given her actions in the RWBY series, some fanfics have her seeking revenge or others seeking revenge on her.
Roman Torchwick could be a likely candidate in some fanfics. Since he had a connection with Neo in the original series, he might be brought back in a fanfic to brainwash her for his own ends. Another one could be Salem. She's always looking for ways to gain an edge, and Neo's skills would be useful to her if she could control her.
The reincarnated character is a main character too. Their actions and decisions drive the story. They have to navigate Neo's life and relationships. And then there are likely antagonists. It could be Salem's minions or other villains from the RWBY series who will be in conflict with the reincarnated Neo and the other characters.
One common theme is loyalty. Their loyalty to each other, whether it's through thick and thin. Another is adventure. They often go on various adventures in the fanfics. For example, exploring new parts of the RWBY world.
Another ending could be that Neo remains brainwashed and becomes a permanent antagonist. She continues to cause trouble for the main characters, and they are forced to either find a way to permanently stop her or live with her as a constant threat. This would create a more tragic and darker ending for the fanfic.
I'm not sure specifically which 'rwby hypnosis fanfic' stories are extremely popular. However, on fanfic platforms, if there is a unique concept like this, it might gain some popularity. It depends on how well the author writes the characters in the RWBY universe and how interestingly they incorporate the hypnosis element.