A quick video for my Battlemage build , which focus on Staff/Technomancy skill tree , which fits for any kind of combat situations .

• Capable of dealing damage at both close and long range , can deal huge damage to one single enemy or a group of enemies.
  ex :
  ( Electric Fist + Eletric Arc for single target )
  ( Berserker + Tornado / Electric Storm for AOE )
  
• Insane mobility with a long cool looking dodge . Style points on every moves/attacks.

Phobos - Really high health and tanky , strongest damage-dealer of all companions with 2-hand weapons. His attacks also have knockdown effects , pinning enemies down in one place.
Amelia Reacher - Tanker Companion in game , really good survivalbility as a Guardian , use mace/shield , can hold a group of enemies and still stay alive for a long time.

2 big meatbags in the front-line , they will hold enemies and give you plenty of times to position yourself , and get the most damage out of your combos.

• Crafting : 1 points ( amelia gives one crafting , outfit for the third )
  
• Charisma : 3 points ( useful for talking tests and small buffs that actually makes companion a little more useful )
  
• Exploration : 2 points , phobos gives the third ( give you ton of loots to sell for serums , recyles for components , or better chance to drop better gears early )
  
• Lockpicking : 2 points and use outfit for the third.
  
• Science : 1 points for out of combat healing.

For Attributes : Max STR/POWER , then dump last points into AGI for some offensive.