If you find IO while Luna is still active, instead of targeting Luna to get her down go for IO. When she dies, her fox dies. This is similar to Barik with his deployable and Inara with warder's field. They all are removed from the field after death
If playing against a Viktor, or any other hitscan champion, try flanking them, because they will have a longer time to react to the damage, and you can unload about two shots before they will detect you and start firing.
Easy way to kill a fernando is to get behind the enemy and hit him from the back which will force him to turn around leaving him vulnerable to champions that were in front of him before,but you will have to be careful of his allies.