Bot that generates a custom ID?

Hey, So in my friends group, we would like a bot that can make users a fake id, not a real one, simply a custom one we designed, but it has to consist the user's name, join date and avatar. I'm not sure if this is possible, but I was wondering if it was, then where would I begin, what's logic behind the coding? You can find an example below. (We're an Ozzy/Sharon Osbourne fan group) so the ID will be somewhat Goth and pink ish, we just need to figure out how it add the players information on to it.