I'm not sure specifically what the'sama sama letter day story' is about as it's not a widely known common story. It could be a very personal or a story from a specific local or cultural context.
Typically, there's the female protagonist who has the maid - like qualities. There may also be a male lead who has some sort of relationship with her, like a classmate or a love interest. And there could be other supporting characters such as her friends in school or rivals who add more depth and drama to the story.
One main theme could be self - discovery. Just like in the original Naruto series, characters in this fanfic often go through a journey of finding out who they are and what their purpose is in the ninja world.
The main characters are Misaki Ayuzawa and Takumi Usui. Misaki is the female student council president and a maid at a cafe. Usui is a popular boy in school.
One of the main features is the detailed storytelling. It really dives into the complex relationships between the characters. The dialogues are sharp and full of the signature 'Kaguya - sama' humor. Another important feature is the art style which is very appealing and helps to bring the characters to life. Moreover, the different routes and endings in the visual novel offer a variety of experiences for the players.
Love and pride are main themes. The story revolves around Kaguya and Miyuki's relationship where their pride often gets in the way of openly expressing their love for each other, leading to comical and complex situations.
In 'hataraku maou sama 11 light novel', the Maou is central. He's the character who drives most of the action. His personality is a mix of his former demon - lord self and someone trying to fit into a human society. Then there's his female acquaintance, who often gets involved in his misadventures and helps him see things from a different perspective. There are also other characters from the demon world who might make appearances and add more complexity to the story.
Obviously, Naruto and Harribel are the main characters. Naruto, the energetic and determined ninja from Konoha, and Harribel, the powerful Arrancar from Bleach.