The person whose pool it is
It seems obvious, but many a party has happened where some newcomer looks around and goes “Wait, whose place is this?” Give thanks to your hosts, people! There would be no party without them/YOU.
The official DJ
Someone who actually knows what the song of the summer is and not the song of 2003. How many pool parties have been screeched to a halt from the incorrect use of early ‘00’s emo? Far, far too many (one is too many).
The big kid
They’re never afraid to break out the slip ‘n’ slide or do a cannonball. Just watch out for when they switch to bellyflops: like a big kid, they need an adult’s supervision.
While everyone else heads straight to the pool, picnic table, or cooler, this hero is quietly assisting the host even though nobody expects a guest to do so. Look for the person gracefully bowing out of a great conversation to open the screen door unasked. Without these people, society would probably crumble.
The weird new significant other
She brought HIM? What do those two have in common? He mumbled something about his band, and now he’s swimming with his shirt on. Finally, something to gossip about later!
The person who overdressed
You know the one -- definitely not in pool party attire, but also the most likely candidate to get thrown in at the end of the night (probably by The Big Kid) to complaints of a ruined brand new shirt and running makeup.
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The official pit master
A crucial party member -- the guy who makes sure everyone is stocked up on burgers and dogs until they’re ready to nap. What exactly possesses this person to play chef for the party is unclear, but we’re not complaining. Saint.
The person who can’t swim
There’s always one guy who never really learned how to swim, which is fun because everyone gets to go, “You don’t know how to WHAT?!?” incredulously, before trying to teach them, thereby discovering that their own form is horrible. It’s one of the few times in life that everyone can bond over someone flailing around in the shallow end.
Just kidding, that guy's not invited.