noun
doppelgänger; double
Refers to a ghostly double or look-alike of a living person, often seen as an omen of bad luck or death. Used in both supernatural and metaphorical contexts.
from German Doppelgänger
彼は街で自分のドッペルゲンガーを見たと言っている。
He says he saw his own doppelgänger in town.
あの俳優
That actor looks just like my double.