Doctor Stone: Very good first episode and interesting premise, the two main characters are so far pretty likable and I can easily see this being a fun science series.
Fire Force: Hard to believe that David Productions could pull of an amazing looking first episode while having to work on the climax of Jojo Part 5 at the same time. While the story so far is very cliche Shonen stuff, I happen to really enjoy very cliche Shonen stuff.
Vinland Saga: Might seem a bit unfair since the first 3 episodes were released yesterday, but if those 3 episodes are to go by then there is a good chance this might end up being a very strong contender for AOTY.
Also Vinland Saga might have my favorite opening of 2019