Necromancer - Straight up the best bookholder for the early game
Jinx - Reliable bookholder
Conjurer without nuke / Ritualist with no charges / Illu who used MH / CL out of retrains / Dusa out of charges - No longer an useful role, can be used to kill
Banshee / Wildling / Dreamweaver - Straight up useless
Potion master - Reveal is only valuable if you got a way to use it
Poisoner - I'd rather RB a TP than rb the guy i'm killing unless he's vet
Medusa / Enchanter - Both share a similar niche, both are pretty useful when not killing.
Ritualist - Guaranteed kills if you know your target role, but is susceptible to RB
Conjurer - Guaranteed kill , more valuable than rit
Coven Leader - Unless you got a perfect comp, in which case necro should be the bookholder, the retrains are too valuable
Witch - Witch is always useful. It's a reveal + Control , meaning you can straight up shut down any cooperation attempt if you don't have the book.
Voodoo Master - Broken role, prevent town from regaining maj. Must be kept alive
Hex Master (Basically 2Kpn if they don't have the book)