Review of Fate/Zero
Want a more mature anime with a non-typical protagonist? This is it. And it's not just the protagonist. Every character in this anime is unique, has their own personality, and even all go through their individual character arcs to arrive at a satisfying conclusion, and that does not mean they all become perfect good guys. Not at all. Animation is great for its time, as one can expect from ufotable. Action scenes are superbly done. This anime uses action sparingly for when it's necessary and every fight scene feels earned instead of gratuitously tacking on one every episode. And yet, it never feels boring as even the nonaction scenes are interesting with layered dialogue and meanings as long as you have your brain with you.
I won't go too much into detail about the story but it gets dark and mature without getting into the teen edgy area. It's innovative, unpredictable, intense, and satisfying.
If you decide to pick it up, you're in for a ride. You won't regret it.