Help

Why does my friend have the title of "golden pawn"? While I don't.

That is a pawniversary flair. You get it on birthday of your account

And why is my friend playing as a bot member when he's a regular person with no membership?

My birthday was on December 9th?

My friend's birthday isn't on that day.

What other pawn symbols remain when commemorating?

That's for the anniversary of when you joined Chess.com, not your actual birthday.

That's a bot that runs automated, just like the @CHESScom account sending you messages.

It was only added a few months ago. You can use it on your account's anniversary date every year.