Next Halloween

Homers death skin
Witch patty and Selma
Fly head bart

House of Evil Shopkeeper
https://tstoaddicts.files.wordpress.com/2015/10/ico_thoh2015_shopkeeperavatar-e1444748718424.png


Count Dracula
http://babysimpson.co.uk/gallery/grabs/citizens/dracula1.gif

Monkey Paw Vendor
https://static.simpsonswiki.com/images/archive/4/43/20140322174703%21Monkey_paw_seller.png

The Devil
https://deadhomersociety.files.wordpress.com/2013/12/bartgetshitbyacar12_thumb.png?w=512&h=384

Gypsy Fortune Teller
http://vignette2.wikia.nocookie.net/simpsons/images/e/e5/Gypsy.png/revision/latest?cb=20100304062947


Blue Demon
http://vignette2.wikia.nocookie.net/simpsons/images/7/78/Blue_demon.png/revision/latest/scale-to-width-down/640?cb=20111114095602


Gremlin (NPC)
http://vignette1.wikia.nocookie.net/simpsons/images/0/0a/7173806830_364e51f3e7_z.jpg/revision/latest?cb=20140802021217

http://www-static.spulsecdn.net/pics/00/00/26/51/265104_1_M.jpg
Vampire Grandpa

http://starcasm.net/wp-content/uploads/2010/10/Simpsons_Logo_Banksy.jpg
Three eyed Crow

http://movies.mxdwn.com/wp-content/uploads/2014/10/Monsters.jpg
And of course these guys.

Also for the theme of the event I'd like to see a haunted harvest type event. I can picture a scenario where Mr. Burns hides radioactive material by a farm and different types of npc monsters are mutated and attack Springfield.

Act 1 NPC: Three Eyed Crows
Act 2 NPC: Jack OLantern Scarecrows
Act 3 NPC: Glowing Radioactive Zombies(Last act Mr. Burns contaminated a graveyard.)