Can I finish Vampyr without killing NPCs? Vampyr Guide and Walkthrough

Can you finish the game without killing anybody?

The short answer is "yes". Vampyr can be finished without killing anyone. There are a few catches, though:

• Without drinking blood, Jonathan will miss loads of XP. Drinking blood from some characters can yield as much as 6000 XP, which is a serious boost. The game is practically begging you to do it.
• Although things will be more difficult this way, you can mitigate this by completing some side activities - investigations, collecting clues, etc.
• More importantly: you have to make sure your crafting is top-notch and keep upgrading your weapons. It's particularly important to access the enhancement that gives you blood points for dealing damage.
• Another important thing is using your XP for strong skills. More about that in the next chapter, entitled "How to create a strong character?"