Emi Fukukado, licensed Pro Hero and Ketsubutsu Academy High School teacher, operates under the alias Ms. Joke. She possesses an athletic build, sea-green shoulder-length hair often partially covered by an orange bandana, and dark green eyes featuring prominent light pupils. Her most recognizable trait is a constant broad smile. Her hero costume includes a sleeveless navy blue top with a high collar, puffed shorts with green and orange pinstripes, a corset dotted with yellow smiley-face pins, a white V-shaped belt, and padded yellow gloves equipped with metallic knuckle plates and wrist guards. She utilizes a white respirator mask featuring smiley-face filters, her "Laugh Mask," to neutralize her Quirk in public. Perpetually cheerful, Ms. Joke exhibits a playful sense of humor and a tendency for teasing, frequently targeting Shota Aizawa (Eraser Head). She persistently tries to make him laugh or smile, openly flirts, and even proposed marriage during the Provisional Hero License Exam. Despite her comedic nature, she maintains professionalism as a hero and educator. She deeply values her students' potential and resents U.A. High School's perceived elitism, criticizing their placement of Hitoshi Shinso in General Studies despite his useful Quirk. She advocates for equal opportunities for all aspiring heroes and resents Aizawa's initial dismissiveness toward non-U.A. students. Her Quirk, "Outburst," forces nearby individuals to laugh uncontrollably, impairing cognitive functions and motor skills. This allows her to subdue opponents via hand-to-hand combat, a strategy observed by Izuku Midodya. She carries equipment like the Laugh Mask to control her Quirk's effects outside combat. Early in her career, she worked at a hero agency near Aizawa's, leading to frequent collaborations that fostered mutual respect, though her claims of romantic feelings were met with skepticism. She later transitioned to teaching at Ketsubutsu Academy, mentoring students who hold a rivalry with U.A. High. Key appearances include observing the U.A. Sports Festival and commenting on Shinso's underutilization. During the Provisional Hero License Exam, she interacted with Aizawa and Class 1-A, revealing their past partnership while coordinating student introductions. She questioned Aizawa for not warning his class about rival schools targeting U.A. participants and later suggested joint training. In the Paranormal Liberation War, she participated in the large-scale raid on Gunga Mountain Villa, helping ambush and capture Paranormal Liberation Front members. During the Final War, she aided in apprehending the villain Skeptic after he attempted to sabotage U.A. High's systems; her students surrounded his hideout based on intel from La Brava, leading to his arrest.