I think he has created a noun, maybe.

However, there are eight kinds of pronouns: personal, interrogative, indefinite, relative, demonstrative, reciprocal, reflexive, and intensive.

You listed most of the personal pronouns except for the 2nd and 3rd person plurals: you, your, yours, they,them, their, theirs.

The interrogatives are as follows: who, which, what, whom, and whose.

The indefinates are as follows: one, (all the compounds made from body and one), someone, anyone, everyone, no one, nobody, several, each, all, neither, either, both, many, few, any, some, and others os the same hazy ilk.

The relatives (relates to an antecedent) are as follows: who, whose, what, which, and that.

The domonstartives are as follows: this, that, these, and those (near and far many and few).

The reciprocals are each other and one another, as in the following:

The lovers longed to touch one another.

The two birds preened each other.

The reflexives refer to the self as an object, as in the following:

He bit himself.
She made a promise to herself.

Intensives drag in compounds of self usually for emphasis.

You yourself are the king!
I myself am the fool.

There is other stuff about pronouns and the various cases too, but I am not going there. Actaully, pronons rather complex creatures.