Lesson of the day : level up the companion before doing his affinity quest so you can equip his/her with the lastest gear.
Anyway, I just finished Doug first affinity quest.
It was amazingly weird.
In the begining Doug sucked, so I got wiped.
I decided to level him up a little, just 1 level.
With that I lvl up his arts and skill.
I wanted to clean up monsters around the boss so I won't aggro them and that's when it got weird and cool. I was able to took down a middle monster and 3 little monsters, the battle was pretty dynamic. I really liked it.
Specialy the deer who shoot missiles!!
LOL
After them, the boss of the quest was not a problem at all. Beatting stronger openement just before a boss is weird and awesome XD