he; she; that person
A polite or slightly distant way to refer to a third person. Can also be used by a speaker to refer to their spouse or partner, often with affectionate or humble nuance.
That person is my father.
My husband (lit. that person of ours) said he'll be late today.
Archaic second-person usage, now obsolete. In modern Japanese, あなた or other terms are used instead.
In classical texts, あの人 can be used to mean 'you'.
彼女 specifically means 'she' (or 'girlfriend'), whereas あの人 is gender-neutral and carries a more formal or reserved tone.
あいつ is a rough, casual way to refer to someone that can sound rude or contemptuous, unlike the more polite あの人.
Standard spelling; the kanji 人 is used for ひと.
Rare kanji spelling; 彼 is normally read かれ, so this form is uncommon and may be confusing.
Compound of あの (that) + 人 (person). The second-person sense is an archaic extension.