void wretches are great and I take a bunch. I take death marshals sometimes, but have been leaving them on the shelf (so I can take other upgrades).
As outcast, Killjoy is almost always a must have (because he starts burried and can pop up when burried). Ama No Zako is also great for scheming. Lazarus is good for bodyguard. I'll also take Taelor or a Strong Arm suit. I've been playing around with Montresor and the Nothing Beast to focus on WP manipulation ( it's still a work in progress).
As Res (I don't play this way too much) I like taking Hanged and try to manipulate the opponents WP. I'll also take the upgrade where I can bring the void wretches, DM, and NB. Bette Noir also works very well since she too has bury mechanics like Killjoy.