Anime is a diverse medium with distinctive production methods that have adapted in response to emergent technologies. It combines graphic art, characterization, cinematography, and other forms of imaginative and individualistic techniques.
Full Answer
If you,’re the only one ordering udon then either “watashi wa udon desu" or “udon wa watashi desu" will work when the server brings the order to the table. in one case it signifies that, speaking about yourself, you get the udon. In the other it signifies that , speaking about the udon, it’s you who's getting it.
Although leaving out the “watashi ga" is perfectly fine. In fact it would be more colloquial to just say. Kyou no tenki suki ja nai if you just plain don’t like it regardless of any other day's weather. So one way to think of “wa" is that it sets the Topic apart from other possible topics. Hope this helps.
There are several ways, but Japanese don’t normally say “you” formally often. I’ll get into possibly why as well. In fact, I should start with why. Addressing someone as you every now and then is a little rude (or very rude depending on the circumstances). The most common you will hear is “anata.”.