Netflix

What you'll need:

-Red clothing
-DVDs
-Then no DVDs
-Then DVDs again

How to sell it:

-Periodically introduce yourself with a different name
-Spend the whole night apologizing, the next day
-Send everyone you hung out with an 1000-word apology email

Epilogue Ron Weasley

What you'll need:

-Red hair
-A gut
-To allow your life to sink into depressing mediocrity

How to sell it:

-Arrive at the end of the party and ruin what had previously been a really fantastic event

Chuck Testa

What you'll need:

-Trucker hat
-Sunglasses
-Stuffed animal

How to sell it:

-Pop up behind girls dressed as sexy animals and say, "Nope. Chuck Testa."
-Pop up behind people dressed as zombies and say, "Nope. Chuck Testa."
-If people say, "Who's Chuck Testa?" say, "Nope. Nevermind."

Tobias Fünke

What you'll need:

-Jorts
-A mustache
-Male pattern baldness

How to sell it:

-Speak exclusively in sexual innuendos
-Leave the Halloween party early, but text remaining partygoers frequent updates about when you might return

Nyan Cat

What you'll need:

-Cat ears
-Paper
-Markers
-Tape
-Cherry Pop-Tart

How to sell it:

-Run around repeating the same jokes for the whole night
-Make people look at you until someone finally admits that your costume isn't actually that funny