The main character could encounter various challenges. For instance, he might struggle to find the right resources or techniques for soul upgrading. There could also be powerful rivals or evil entities trying to prevent his progress due to jealousy or their own malicious intentions.
Rambo might face physical obstacles like difficult terrain and the monster's strength. Also, he could struggle with finding the monster's hideout.
He usually has to deal with internal power struggles, external threats from other kingdoms, and the responsibility of keeping his subjects happy and safe.
One big challenge would be in his studies. Magic often requires precise wand movements and seeing spells being cast by others clearly. Without his glasses, he could misinterpret what a teacher is demonstrating, and this could affect his learning. Moreover, in Quidditch, he would have a hard time seeing the Snitch or other players clearly, which is crucial for the game.
He often has to deal with power struggles within the royal family. Also, external threats like invading armies or magical foes can pose major challenges.
Well, Naruto being sealed away would face many difficulties. Firstly, he'd lose the opportunity to train and grow stronger with his friends. Secondly, he might struggle with self-doubt and fear of being forgotten. And lastly, there'd be the constant battle to keep his hope alive in that sealed state.
He faces tougher opponents. In the Chunin Exams, the competitors are more skilled. Naruto has to deal with more complex jutsus and battle strategies from his rivals. Also, he has to prove his leadership skills, which is crucial for a Chunin.
He might face a profound sense of loneliness and the burden of being the sole survivor. Also, he could encounter new magical threats that emerged after the universe's collapse.
One such light novel could be 'The Hero's Journey'. In this, the MC faces numerous hurdles and overcomes them through determination and growth.
One challenge he might face is dealing with unruly students. Since Percy has had so many adventures, he may have little patience for students who misbehave just for the sake of it. Another could be adapting to the teaching curriculum. He's used to action - packed situations, not the structured learning plans of a school. And he may also struggle with the bureaucratic side of education, like filling out paperwork and following school regulations that seem so different from his previous experiences.
He'd probably have trouble coordinating the two halves and dealing with their different thoughts and desires.