To the Darkest Dungeon DM from last thread.
>Abomination
Moon Druid with a custom wildshape
>Antiquarian
Mastermind Rogue (because it's just as useless in combat as an Antiquarian).
>Arbalest
Battlemaster Fighter w/ sharpshooter is a good idea, but maybe Hunter Ranger w/ sharpshooter for Hunter's Mark and Volley (both features I personally use quite bit in DD).
>Bounty Hunter
Fighter/Rogue makes sense. Look up some ideas to implement/improve net and hook use.
>Crusader
Any beatface Paladin oath (Crusade and Vengeance being the most obvious).
>Grave Robber
Rogue Assassin works great.
>Hellion
Barbarian Berserker also works great.
>Highwayman
Try Champion Fighter for this. Highwayman is just a high-crit beatstick in most cases, and his health is usually pretty decent.
>Hound Master
BM Ranger with a club.
>Jester
Straight Valor Bard.
>Leper
I'm tempted to say Paladin. He's a pretty religious guy, but I guess that doesn't need to reflect on his class.
>Man-At-Arms
War Cleric, my man.
>Occultist
GOO Tomelock. Lots of area control spells, too.
>Plague Doctor
Alchificer is perfect.
>Vestal
Light Cleric seems breddy good.
For general suggestions, look up some systems to make insanity a thing.
Toss around curios and reward them for sticking their necks out with the odd stat improvement and the like.
Magic Items should maybe be two sided, but not HEAVILY so.
If you trust them, make combat always ~1/2CR too high.
Exploration should be just as interesting as fighting, so really brush up on your purple prose and attention to detail.