The rival characters are also interesting. They constantly challenge the gamer shinobi, pushing them to improve. They might have different playstyles or access to unique abilities, which makes their battles against the main character full of tension and excitement.
The in - game mentors can be really interesting. They guide the gamer shinobi, but might have their own hidden agendas. For example, they could be using the gamer to achieve something in the game world that they couldn't do on their own.