Take Death Sentence, then respec and take out all points you put into Agility and put them into Strength (Death Sentence alone has enough Speed to hit the enemy).
Roald Could use either Death Sentence or Supremacy, and Veradux definitely is best suited with Wrath of the Council.
Emerald Death for Sonny (unless you speed specced him, in which case you should get ruby blade from the store and get the specialist's primary weapon). Biological is all about strength (unless you go for speed build like I mentioned above), so you want as much as you can get.
Wrath of the Council for Veradux. High instinct means high healing, high instinct+high lightning piercing means powerful electrobolt.
Death Sentence for Roald. High sstrength for him means more powerful attacks, then speed and vitality are always very useful for a teammate.