Kyou Senshina Mob Mujikaku Ni Honpen Wo Hakai - Suru Raw Extra Quality ((link))

They don’t think: “Am I interrupting the hero’s journey?” They think: “I am solving the problem right now.”

Translated loosely: “An aggressive, self-important mob character, lacking self-awareness, destroys the main plot — raw scans, extra quality edition.” They don’t think: “Am I interrupting the hero’s

That trope is captured in the messy, passionate Japanese-English hybrid phrase: self-important mob character