Somnambulist allowed the user to put targets to sleep by exuding a sleep-inducing aroma from their skin.
Somnambulist was described as being more effective on males than on females, giving Nemuri an obvious advantage against men. Regardless of that, anyone who breathed in enough of the aroma would eventually fall into a deep slumber, which would make it difficult for opponents to confront Nemuri at close range.
In the anime, the mist that represents the Quirk's aroma is colored violet.
It is possible to avoid the effects of Somnambulist simply by not breathing in the aroma. This put Nemuri at a disadvantage against opponents who had their mouths covered by masks that could function as air filters. Alternatively, an opponent could cover their mouth with something to hold their breath, as demonstrated when Minoru Mineta avoided the Quirk's effects by covering his mouth with Hanta Sero's Tape.
Somnambulist makes Nemuri an efficient referee for competitions, as she was able to prevent dangerous plays by just putting the violating contestants to sleep.
For legal reasons, Nemuri was forced to wear a bodysuit to counter her provocative costume, which could hinder the effectiveness of her Quirk, as she must rip it off first to release her aroma. She stated as much in an interview where she said she was trying different thin materials in her costume that she can tear away easily to release her fragrance.
Nemuri utilized a pair of hand fans in order to spread her aroma more easily, allowing her to put more enemies to sleep from a safe distance while also being able to stay on the move. She was able to release and aim her fragrance as well, but her support items were designed to pick up traces of her scent and allowed her to fling it in different directions, thus giving her Quirk more accuracy.
- Somnambulist's Japanese name literally translates to "sleep fragrance" (眠り香 nemuriga?).
- A somnambulist is a sleepwalker.
- This Quirk works similarly to Gas. Unlike Gas, however, Somnambulist doesn't have toxic properties, has no direct effect on the user, and isn't potent enough to put someone into a coma.