あいつはいったい何者だ？
Sentence Analyzer
English Translation
Who the devil was that?
Furigana
あいつはいったい何者 だ？
Romanji
Aitsu wa ittai nanimono da?
Words
彼奴
(あいつ、きゃつ、かやつ、あやつ)
he; she; that guy
は
(は)
topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis
一体
(いったい)
...the heck (e.g. "what the heck?"); ...in the world (e.g. "why in the world?"); ...on earth (e.g. "who on earth?"); one object; one body; unity; one form; one style; one Buddhist image (or carving, etc.); generally; in general
何者
(なにもの)
who; what kind of person
だ
(だ)
be; is; indicates past or completed action; indicates light imperative