Deidoro is a very lean but muscular man with greasy dark hair, reaching just below his shoulders, circular and rather deep-set eyes and notably straight teeth.
Like all members of Shie Hassaikai, Deidoro wears a mask, his one being plain and having drains fitted into the eye-holes so that the alcohol he consumes can drip through. Aside from that, Deidoro wears nothing but a furry vest and dark pants with black shoes.
Befitting his Quirk, Deidoro seems to be an alcoholic, as he keeps drinking even while talking or engaging his enemy, letting the alcohol run down his body.
Due to his intoxication, he has slurred speech and often elongates words in his sentences. He also has some strange habits like moving around by crawling through the ceiling while upside-down.
He is rather energetic, but can also get angry easily.
Deidoro is teamed up with Shin Nemoto to stop the heroes from catching Overhaul. During his encounter with Mirio Togata, Deidoro used his Quirk to make Mirio lose his balance. Deidoro then chugs down some alcohol while telling Mirio to stay away from him in order to be safe from his Quirk.
After Shin Nemoto tries to shoot Mirio, failing to do so due to Mirio's Quirk, Deidoro gets angry and asks him if he's drunk. Deidoro then draws some daggers to attack Mirio, however he and Shin are easily defeated.
Since Deidoro is seen drinking shortly before using his Quirk, the strength of Sloshed may be dependent on how much alcohol Deidoro consumes. This may have contributed to his alcoholic nature, or could be a completely independent variable.
Daggers: Deidoro possesses several throwing knives that he holds between his fingers.