Formal:
* 他 (tā): This is the most common and neutral way to say "he" or "him."
* 这位 (zhè wèi): This literally means "this person" and can be used in a more formal context.
Informal:
* 他 (tā): This is still the most common way, even in informal settings.
* 这小子 (zhè xiǎo zi): This literally means "this kid" and is used for a young man in an informal context.
Examples:
* 我看见他了。 (Wǒ kàn jiàn tā le.) - I saw him.
* 这位先生是谁？ (Zhè wèi xiānsheng shì shuí?) - Who is this gentleman?
* 这小子真调皮。 (Zhè xiǎo zi zhēn tiáo pí.) - This kid is really naughty.
It's important to note that the choice of pronoun can depend on the relationship between the speaker and the listener. For example, using "他" to refer to a close friend might be considered too formal.
Always consider the context and formality of the situation to choose the most appropriate way to say "him" in Chinese.