Popsugar Entertainment Halloween Riverdale Halloween Costumes How You and Your Friends Can Dress Up as Riverdale Characters This Halloween October 23, 2019 by Kelsie Gibson View On One Page Photo 12 of 15 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 12 Hiram What to wear: The fanciest suit you can find. Wear your hair slicked back. How to act: So powerful that it's almost scary. You're capable of anything, but you keep a good poker face. Previous Next Start Slideshow HalloweenRiverdaleHalloween CostumesHalloween Costumes 2019Group Halloween CostumesPop Culture Halloween CostumesTV