One Man Army Games gets a website!!

[Pete]

's can be used to make most nouns possessive, except there are exceptions like it and who.

"it's" is never possessive.

In fact, here's a quote from The Grammar Guide website:

You must simply remember that it's is always a contraction. It's never a possessive! It's really not that confusing, because each word has its own function.

You're right about "its" -- that can be plural if you are using the word "it" as a noun. For example, "Joe wrote several 'its' in his essay." But that type of usage is very rare.