KanjiJLPT N1
I (Boyish Male)

me, I (male), servant, manservant

Mnemonic

Butler Alfred has a side business: coaching timid boys to introduce themselves boldly. A nervous kid whispers his name. Alfred kneels, saying, 'Start with a strong I (Boyish Male)—say it like you own the room!' The boy beams and declares 'I!' proudly. Alfred's business of forging boyish confidence booms.
Additional thoughts
Picture Alfred in his suit, kneeling to a small boy's eye level in a brightly lit classroom—his 'confidence business.' The boy's shy whisper transforming into a proud 'I!' anchors the youthful, casual male pronoun.
Quick recall
Butler Alfred's business is coaching shy boys to proudly say I (Boyish Male).

Details

The keyword for 僕 is i (boyish male). This kanji is a first-person pronoun used predominantly by males, carrying a tone that is more casual, youthful, and modest compared to other masculine pronouns. It is commonly used by boys and younger men in everyday conversation, conveying a sense of informality and approachability. In more formal or literary contexts, the character can also mean "servant" or "manservant," reflecting its historical origins as a humble, self-deprecating way of referring to oneself.
On'yomi
ぼく
Kun'yomi
しもべ