Butcher's Circus: DoT Hellion Team
This sort of setup has been my most successful for DoT Hellions. Or at least the most interesting, where she isn't just a breakthrough bot. This team doesn't rely a ton on multi-target DoT, instead being really strong at taking down beafy targets. There's an interesting dynamic with the SB and Hellion, where SB can use Adder's Kiss to apply a heafty blight DoT to one of the front liners, which then sets the Hellion up to use Bleed out for a heafty bleed DoT. If Jester gets pulled round 1, you can puncture into breakthrough to allow him to drop his Battle Ballad.
SB: I'm running her with Crushed Hemlock instead of Viper Spear Tip because the accuracy isn't a huge deal for SB, and Hemlock additionally allows Adder's Kiss to deal even more damage as it's a melee ability, while still keeping it more consistent in applying the blight. I've tried running her with Pierce instead of Impale, but I prefer having Impale especially since Adder's Kiss already deals insane single-target damage.
Hellion: I run her with Razor Hairpin and Hemlock, which allows both her bleed skills and Breakthrough to have reasonable impact. You absolutely need her bleeds to apply so Hairpin is a must, while Hemlock makes Breakthrough way more dangerous, on top of the extra DoT on her other offensive skills. I run Bleed Out instead of Wicked Hack because if you're gonna run DoT Hellion, you need something with punch and Hack just doesn't have that. Interestingly, the DB resist debuff synergizes well with your finishing characters, good for knocking a target down to death's door to be followed up on by one of your finishers.
Jester is a must for the Battle Ballad accuracy because Hellion accuracy is a joke. You DON'T wanna miss a Bleed Out. Nothing special about him, just Jester things
Antiquarian: She's the only healer so instead of Materia Pestis I bring Tears of the Lost for the extra heals, and then Finisher so that I'm not relying on just the Jester as a finisher.