Epic Mickey 2: The Power of Two

Simple, just use Thinner instead of Paint on every enemy you encounter. Using thinner is generally seen as hostile and therefore doesn't endear you to some characters, especially Ghost Ian in Blot Alley who will deny you a Unique Pin if you dare to use it on the Spatters in the area. Since you need to do two playthroughs, save using thinner for when you do your 'speed run' to unlock the Off Track trophy so that way you don't have to worry about displeasing anybody. Alternatively you can just wait until you complete Perfectionist and Master Pin Collector then simply hit any enemy heavy area and thin them all until you get 100 on the kill count.