One of the main themes is adventure. The characters are constantly on quests and facing various challenges in a strange and magical world. Another theme is friendship. The group of misfits in the story, like Kazuma, Aqua, Megumin and Darkness, form a unique bond through their shared experiences.
Kazuma is also a very interesting character. He's the reluctant hero. He was just an ordinary NEET who got transported to this strange world. He has to use his wits and the strange abilities of his party members to survive. His snarky comments and his growth from a lazy person to a somewhat more responsible adventurer are really engaging aspects of his character.
In fantastic fiction, 'aj banner' could be many things. It could be the name of a group or a faction within a fictional world. For example, in a fantasy story about a war between different kingdoms, 'aj banner' could be the emblem or the name of a group of warriors. It might also be a creative name for a place, like a tavern or a castle named 'aj banner'. But again, we need more context to be certain.
If 'aj banner' is a character, it could contribute by being a protagonist or an antagonist, driving the story's plot forward through their actions and decisions.
Inner Mongolia's Siziwang Banner and Siwangzi Banner were the same place. The Siziwang Banner was a flag of the Inner Mongolia Xilin Gol League, and the Siwangzi Banner was a town under its jurisdiction. Therefore, the two were different names for the same place.