Rufous

Thanks for everybody here for turning me on to the dual mortar monk stunning surge build! I've been using it on Xoti and it has been great. I'm level 11 and she's pretty far ahead of all my other party members in damage.

It's made me realize that I might not have built my companions for damage very well. My main guy is a Healing Wall Herald, so he does basically no damage, and fights take a long time (with hardcore Deadly Deadfire on PotD). Do you guys know any other builds for companions that are as good for dps as the Xoti monk dual-mortars stunning surge build?

Mirke as Shadowdancer (Monk/Streetfighter) can be great with blunderbusses as well. Doesn't need to be mortars. Xefa's and Kitchen Stove are nice.

Aloth as Battlemage with Citzal's + Mule Kick and later Clear Out is doing very well, too. Clear Out + Citzal means number-of-enemies * number-of-enemies hits and does tremendous damage for only 2 Discipline. And of course he still has his usual nuke spells.
Use Essential Phantom to produce two guys with Spirit Lances. Bonus style points when wearing Devil of Caroc + Helm of the Falcon.  But it's also highly efficient to wear Rekvu's Fractured Casque , cast Nectoric Lance on himself to get a rel. minor injury and then be immune to your own Slicken.
Zandethus' Draconic Fury (form that unique grimoire) is also awesome with a Battlemage.

Tekehu can be a single class Watershaper using either Lord Darryn's Voulge and Deltro's Armor to boost his Powel Levels with shock through the roof and go melee with lots of storms stuff - or use the Watershaper's Focus to boost his Water/Freeze PLs and be ranged. Take everything that boosts PLs further.
In addition to that he has a Foe-only Chillfog which is just awesome.
Also works as Theurge with the melee approach. Everytime you wait for phrases to build up for your next shock invocation you can cast a druidic shock spell. You're casting shocking spells all the time basically. Best thing about him relaly is that he's got so many foe-only spells.