Monado Boy comes from the Xenoblade Chronicles series, where the Monado is the legendary red sword wielded by protagonist Shulk. Fans clipped the shouted nickname from gameplay and shared it on soundboards and in meme edits, where it became shorthand for calling out a would-be chosen one. The phrase stuck because Xenoblade has a passionate fanbase and Shulk reached wider audiences through Super Smash Bros. It remains popular in gaming communities as a quick, recognisable joke for sword reveals and power-up moments.