Board Thread:Questions and Answers/@comment-172.56.12.209-20150517093827/@comment-26662455-20171208102134

You can equip Kanon with Friend or Foe Blood Bullets in her Personal Abilities page. I haven't tried it in actual combat so I can't guarrantee how much would it affect her Friendly Fire Control though. (I don't often bring her to missions because my healer mains are Kota and Ciel ^^")

Sadly, if the BB FoF hasn't been unlocked yet, you would have to tolerate the Friendly Fires until her Character Episodes are complete and then she's gone for good.

And Ken, not everyone has the same level of skill as you are so avoiding Kanon might not be as easy to others as it is to you. :V

EDIT: Equipping Kanon with an FoF Bullet cancels out her Friendly Fire Control Lvl -1 skill. Went on a mission and three friendly fires (primarily because I kinda knew she was firing there and I still went for it lol)