Llamas tend to be calmer than alpacas. But they don't kick unless they feel threatened. He certainly could potentially be a guard llama. Time will tell on that one.
Alpacas are much more kicky if they can't see. Huge huge huge pet peeve of mine is an alpaca whose topknot covers their eyes. How would you feel if you could only see straight ahead out of a small area and you are prey. Trim their topknot until you can see their eyes from all sides. My birthing customers knew I would trim their alpacas topknots. I think some of them purposely brought them over with overgrown topknots so I would trim them. I trimmed so many that I got very good at making them show worthy trims.