Archaic or dialectal first-person pronoun, mainly used by men. In contemporary Japanese, it survives in some regional dialects (e.g., Tohoku, Kanto rural areas) and in period speech. Often carries a rustic or rough nuance.
I don't know nothin' about that.
I'm a farmer.
私 is the neutral, gender-unmarked word for 'I' used in standard speech, while 己(おら) is informal, dialectal, and mainly used by men.
おら is a dialectal first-person pronoun ('I/me') used by rustic or rough-speaking characters, while オラ is an unrelated Spanish-derived greeting meaning 'hello'.
Archaic/dialectal first-person pronoun. The kanji 己 is used for this reading in older or dialectal contexts.
Kana spelling is common in modern dialectal or colloquial writing.
Alternate kanji form for おら, also archaic/dialectal.
Kanji form with plural marker ら, but used as singular in some dialects.
The origin is uncertain. It may be a contraction of おのれ (oneself) or a dialectal variant of おれ. The reading うら is an older form.