KanjiJLPT N3
Other

other, another, the others

Mnemonic

Butler Alfred always serves the same master—until one evening a beaver waddles through the door, claiming to be the other master of the house. Alfred raises one eyebrow but calmly sets a second place at the table. The beaver is clearly someone else entirely, a stranger from beyond the estate grounds.
Additional thoughts
Picture Alfred standing stiffly with a silver tray while a dripping wet beaver sits at the head of the dining table. The beaver represents an outsider—someone other than the usual master, completely foreign to the household.
Quick recall
Butler Alfred serves a beaver who claims to be the other master of the house.

Details

The keyword for 他 is other. This kanji refers to something or someone that is different, separate, or apart from oneself or the subject at hand. It conveys the concept of "other" or "another," often used to distinguish between what belongs to oneself and what belongs to someone else. It carries a sense of external existence beyond one's own sphere.
On'yomi
Kun'yomi
ほか