Since Revalopod submitted a discussion for Fiend Folio, I thought I;d give a shot at making some ideas for Tainted Treasure roles.

-The Alcoholic
Starting Items: The Bottle, IBS, Lemon Mishap
Misc: Lemon is in pocket active slot

-The Spree Killer
Starting Items: The Bad Onion, Lusty Blood, Berserk!

-The Grinder
Starting Items: The Leviathan, Alabaster Box
Note: In case of confusion, The Leviathan in this case refers to the tainted version of Capricorn, not the transformation of the same name.
Misc: Al. Box is in pocket active slot

-The Tacky
Starting Items: 8 Inch Nails, Raw Soylent, The Maelstrom
Note: This role is based on the tack shoot from Bloons TD

-The SMB Hater
Starting Items: Lil' Slugger, Doctor's Remote

-Scyther
Starting Items: Crystal Skull, Mom's Knife, 20/20
Misc: Tainted Stranger spawns with no health and dies in order for Crystal Skull to activate and respawn as The Forgotten.

-The Strict
Starting Items: Gemini, The Basilisk, Child Leash

-The Breacher
Starting Items: The War Maiden, Continuum, Undefined

-Tainted Treasure Fan
Starting Items: Purple Star, The Sad Onion
Note: Can replace The Sad Onion with any item that has a tainted counterpart in Tainted Treasures