Character development. A betrayed hero often has to change and grow. They might start out trusting and naive, like Frodo in 'The Lord of the Rings' who was betrayed by Gollum. His journey from a somewhat innocent hobbit to a more world - weary hero makes the story captivating as we see him adapt to the betrayals around him. This evolution of the character keeps readers hooked.
One example could be 'The Count of Monte Cristo'. In this novel, Edmond Dantes is a hero who is betrayed by his so - called friends and thrown into prison unjustly. He then uses his intelligence and willpower to seek revenge and reclaim his life.
Isolation is also a common theme. When betrayed, the hero is often cast out and has to face things alone. They may lose friends or allies. In 'The Rising of the Shield Hero', the hero is isolated from the start due to the false accusations against him. And self - discovery is another theme. Through the process of dealing with the betrayal, the hero discovers more about their true self, their values and what they are really capable of.
The Boku no Hero manga is finished. It reached its conclusion after a successful run, leaving fans with a complete narrative and memories of an exciting journey.