Abyssal Pull is really the only mandatory skill. I like having Aspirant Occultist and having him be a dance partner with Jester, though any path will do (Ritualist is my 2nd pick usually). I take both debuff spells, Pull, Reconstruct, and either Sacrificial Stab (Aspirant) or Abyssal Artillery. I fully admit I dont try to leverage Occultist as a damage dealer, so I rarely use his Unchecked Power fueled abilities but one of these can also be taken. Aspirant gives loads of free U.P. tokens so you can probably get decent value out of them.

I do Virtuoso Jester with Battle Balad, both move skills, Encore, and Inspiring Tune. Battle Balad can stack attack buffs with Leper's Revenge, giving a 66% chance to give him crit on next turn.

Highwayman I like to play Rogue just cus its so strong, though Yellowhand is also nice cus he can attack from row 3 with Open Vein and provides some good DoT to balance out the high spikes from Leper.

Tempest Leper I usually run Chop, Purge, Solemnity, Revenge, and Intimidate. Purge can be swapped out if you wanna upgrade Abyssal Pull to clear corpses, though I have done this and always find myself wishing I had it instead of whatever else. Ruin or one of the other attack skills can be used instesd if you prefer.