Consider the following table:
I you/Thou he she it we you they
me you/Thee him her it us you them
my(mine)your/Thy his her its our your their
myself yourself/Thyself himself herself itself ourselves yourselves theirselves
mine yours/Thine his hers -- ours yours theirs
mine yourn/Thine hisn hern ourn yourn theirn
The first line contains the nominative pronouns (the grammatical case of the subject of a sentence). Notice with the second person singular, the formal form of address is included (Thou), which is mostly archaic, aside from Shakespeare and the King James bible.
The second line contains the objective pronouns (the case of the (in)direct object of a sentence or preposition).
The first and second lines are nouns (yes, they are called pronouns because they take the place of a noun, but, still, they function exactly like nouns do).
The third line are adjectival pronouns, i.e., they act as adjectives, modifying another noun (or noun-phrase). They are the simple possessive pronouns, sometimes called the attributive possessive. Note that there is the archaic usage of changing ‘my’ to ‘mine’ in front of a noun beginning with a vowel (like a/an) as in, “Mine eyes have seen the glory of the coming of the Lord…”
The fourth line are the reflexive pronouns. These take the place of the second line of objective pronouns when the subject is the same agent as the object… thus the ‘reflexive’ part. They are objective case, and function like nouns. “I gave myself a bath.” As noted earlier in the thread, himself is the oddball in that the objective pronoun of ‘him’ is used instead of the possessive form of ‘his.’ Odd.
Though, when using ‘self’ not as a reflexive suffix, but as a proper noun, as in, “What is his feelings toward his own identity and place in the world… how does he regard his self?” Then “his self” is OK.
The fifth line is what is called the absolute possessive pronouns or genitive possessives. Again, we have pronouns that function like true nouns. Two things to note:
First, there’s really no third person singular absolute possessive pronoun. No itss. <shrug> It’s not how we talk. Imagine this dialogue.
“Do you like the porridge the girl is holding?”
“Yes, I like hers. I’ll take hers.”
“Do you like the porridge the table is holding?”
“Yes, I like its. I’ll take its.”
We just don’t do that (normally). We’d say, “Yes, I like that. I really do like it. I’ll take the table’s.”
Second thing to note is that the first person (mine) and the second person formal (thine) end in the letter sound of ‘N’ rather than ‘S’. In fact, the use of the ‘N’ or ‘EN’ suffix to form the absolute possessive pronoun is older than the use of the ‘S’. The use of the ‘N’ not only survives in ‘mine’ and ‘thine,’ but if you look at the sixth line, certain regions of Southeast U.S. still use the ‘N’ suffix. I believe it pops up in Huckleberry Finn. While the rest of the country might think the ‘N’ is backwoods and backwards, it actually has a more ancient tradition!
Peace.