KanjiJLPT N1
I (Archaic)

I, my, our, one's own

Mnemonic

A sage finds five ancient scrolls. Opening his mouth, he uses the dignified pronoun I (Archaic): 'I alone have deciphered all five!' His mouth trembles with pride — only in ancient times would someone refer to themselves so formally after conquering five sacred texts.
Additional thoughts
Five sits on top of mouth in the kanji. Picture a robed philosopher holding up five fingers, mouth open wide, proclaiming 'I' with ancient gravitas. The loftier the self-reference, the older it sounds.
Quick recall
A sage holds up five fingers, opens his mouth, and declares I (Archaic).

Details

The keyword for 吾 is i (archaic). This kanji is an old, literary form of the first-person pronoun, used in classical Chinese and ancient Japanese texts to refer to oneself. Unlike the more common modern equivalents, 吾 carries a formal and elevated tone, often appearing in philosophical writings, poetry, and historical documents. It conveys a sense of dignified self-reference that was standard in earlier periods of the language.
On'yomi
Kun'yomi
われ、わが-、あ-