Kyou Senshina Mob Mujikaku Ni Honpen Wo Hakai Suru Raw Hot Exclusive -

When a background character becomes the strongest person in the room, the original "Protagonists" of that world often look incompetent or redundant, which is a major draw for fans of this subgenre. Genre-Specific Appeal

True to the title, his presence causes the "main story"—usually involving aristocratic factions and traditional hero tropes—to collapse as he solves crises with brute force before they can even develop.

If you are looking for the vibe of your search phrase, here are actual, officially translated works that match perfectly:

It pokes fun at typical magic school and dungeon tropes by having a "mob" character do all the heavy lifting.

The reference to "mob" and "mujikaku" could imply a connection to anime or manga series that involve supernatural or paranormal elements. There are several series that explore the daily lives of characters in extraordinary circumstances, especially in the realm of monster or spirit-filled worlds.