Singular: 我 / 你 (您) / 他 / 她 / 它 Plural: 我们 (咱们) / 你们 / 他们 / 她们 / 它们
Chinese has one form per person and uses it for subject and object alike. 我 is "I" and also "me"; 他 is "he" and also "him".
Nothing changes shape. Where English swaps I/me, he/him, she/her, Chinese keeps the same character in both slots.
All three are tā. The distinction is written only: 他 for a man, 她 for a woman, 它 for a thing or an animal. In speech there is no way to tell them apart, and listeners rely on context.
它 is used much less than English "it". A Chinese sentence usually drops the pronoun instead: 好吃吗?– 很好吃。
One syllable, nín, for a customer, an older person, a teacher. It has no ordinary plural – for a group, 你们 is the polite form too.
我们, 你们, 他们. A mixed group of men and women takes 他们.
咱们 is a northern alternative to 我们 that always includes the listener. 咱们走吧 means "let's go"; 我们走吧 can mean the speaker's group is leaving without you.
There is no separate "my" or "your" – add 的 to the pronoun.
With family and close relationships the 的 drops: 我妈妈, 你朋友.