Since I've managed to wrangle my PC issues for now, here's a build I've been screwing around with.
>Veteran is unnecessary because Warming Up gives physical immunity and Delicate Dance allows his cooldown to recover quickly enough to keep it up all the time
>Tough Spirit would be nice, but it uses his High-End Antifreeze personal mastery to cleanse debuffs at the start of his turn
>Spams mental debuffs and gets his turns back quickly with Quick Grasp + Altruist
>Draki's Perfect Scale in the gear slot for its broken as fuck effects
Pretty much it's an unfair AT manipulator build that feeds the party AT with finales and recovers its own AT when allies kill stuff. Don't play with Body/Mind Unity enabled because he'll become Exhausted in no time.