Signs as Supernatural objects
Aries:The Mark of Cain
Taurus:Sammy's moose hair
Gemini:Samulet
Cancer:Trenchcoat
Leo:Impala
Virgo:Flannel
Libra:Dean's leather coat
Scorpio:Sam's wifi
Sagittarius:Devil's Trap
Capricorn:The demon knife
Aquarius:Cas's eyes
Pisces:Anti-possession symbol

Signs as Supernatural characters
Aries:Dean Winchester
Taurus:Crowley
Gemini:Bobby Singer
Cancer:Castiel
Leo:Gabriel
Virgo:Jo Harvelle
Libra:Sam Winchester
Scorpio:Bela Talbot
Sagittarius:Benny Lafitte
Capricorn:Kevin Tran
Aquarius:Charlie Bradbury
Pisces:Hannah

Signs as Supernatural characters (2)
Aries: Charlie Bradbury 
Taurus: Sam Winchester 
Gemini: Crowley 
Cancer: Castiel (believe it or not)
Leo: Metatron 
Virgo: Bobby Singer
Libra: Balthazar (remember him?)
Scorpio: Lucifer 
Saggitarius: Meg 
Capricorn: Kevin Tran 
Aquarius: Dean Winchester 
Pisces: Garth Fitzgerald

How you die
Aries:sacrificed yourself to save the boys
Taurus:pinned to the ceiling and burned
Gemini:Lucifer snapped his fingers and you exploded
Cancer:stabbed in the backLeo:attacked by hell hounds
Virgo:throat slit by Meg 2.0
Libra:shot by shape-shifter Dean
Scorpio:in an explosion to save the ones you love
Sagittarius:eyes burned out from looking at an angel for too long
Capricorn:turned into a vampire so Dean cut your head off
Aquarius:stabbed by Metatron
Pisces:some weird voodoo shit

What kind of monster
Aries: Werewolf
Taurus: Leviathan
Gemini: Shapeshifter
Cancer: Mermaid
Leo: Demon
Virgo: Angel
Libra: Fairy
Scorpio: Siren
Sagittarius: Ghost
Capricorn: Gjinn
Aquarius: Vampire
Pisces: Reaper