Best Action show: Re:Zero
Not only are the action sequences impressive, but they always carry narrative significance and weight which makes it even better. Throw in some surprisingly complex themes, characters and the like and some overall great writing and you have a show that definitely stands out from the crowd among the numerous other isekai series.
Best romance: Looking Up at the Half-Moon
Old series that needs more love. The relationship between the main characters develops very naturally and the drama never feels forced. It deals with some very heavy themes (mortality chief among them) but does so very well. Short and beautiful series.
Best sports: Haikyuu
Haikyuu has a huge cast of well-developed or well-written characters, great music and animation and more importantly it does a fantastic job of capturing the world of high level competitions. You feel what the characters feel watching it and if you've been in similar environments yourself it only hits harder.
Best studio: A-1 Pictures
I'm not super familiar with specific studios and did quick research for this one. In the end it came down to A-1, Kyoto Animation and Production I.G. which all had a good number of shows I really liked under their belts - stuff that had story, characters, music, art style and animation all that I liked. In the end, I think A-1 had just a bit more content that I've ranked really highly so I gave it to A-1.
Best movie: Your Name
Gorgeous animation, solid music and a well-crafted story that continues to stick with me as one of my favourite movies, period. This is one of those movies that was so good it sparked a movement of people trying to imitate its look and narrative vibes and as of yet nothing has quite gotten there.
Best Horror: Higurashi
I'm not going to do one of these and not find an excuse to include my favourite franchise of all time. The atmosphere, the story, the characters, the music, the lore, the worldbuilding... the writing again. It's all just too damn good.
I'll come back to do some more I've thought of later. Will do best comedy and the adaptations then too. The former because I tend to like a lot of comedy's more for their dramatic elements than their humour so it feels disingenuous to put a lot of them in as favourite comedy without giving some thought. The adaptation ones I need to think on too because I'm floundering a bit there given how little of the source material I've consumed for a lot of adaptations.