Build for endurance runs. [Fatal Attraction] every 30 seconds for 5 seconds draw enemies attention which gives you additional layer of your survivability. Synth set is pretty useful overall as it gives you more health orbs and reload your holstered weapon which I found pretty nice. Self revive plus several modes make the companion pretty durable so you won't leave without vacuum and radar for long. Thumper combined with a good weapon might be pretty powerful support firepower and/or status applicator.

Shared polarities:
Eidolons
Profit-Taker

Any companion does one thing at a time. To distingiush which one it does quick check of active percept mods in order where top-left has highest priority, bottom right has lowest. The most important actions should be put first. I reordered default placement of polarities to make order better visible.

Actions priority order is:

1. [Vacuum]
2. [Fatal Attraction]
3. [Thumper]