OCC published Neverwinter Companions Guide for Support Classes
A quote from the article:
It can be confusing to select companions if you play a support class. DPS classes are pretty straightforward: choose companions that boost your damage output. However, support roles can be a bit more confusing. The main idea is to choose companions that either buff your party, debuff the enemy, or boost your stats that contribute to your support role. This list is going to include the companion names, Active Bonus, and relevant buff powers.Neverwinter Companions Guide for Support Classes