I wonder if it is too formal to use the kanji for such a common expression
like this. However, I like to write most Japanese words with kanji since I
write college documents.

Additionally, what do you think about using kanji this way in video subtitles?
Since I speak, if a rare kanji appears, I would pronounce it right away, thus,
what do you Japanese speakers think about it?

I also write あなた as 貴方 so much and many others. Is it too hard?
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kanji orthography hiragana furigana kanji-choice
Should I write 此方 or こちら?
Writing something with kanji doesn't necessarily make the document more
"college worthy". I'll just say that in all the years I have been here, I
probably never saw 此方 written as such. But I have seen 貴方 quite a few times.
There is no easy way to know what word are commonly used in kana or kanji
other than read a lot in Japanese and get used to it.

If no one can read the word you write, you might get the exact opposite result
that expected by using it.

For example, Lemon (レモン) can be wrote 檸檬 but seriously, the amount of people
who know that or can read/write that word are very few.  
Same goes for spider(クモ)(蜘蛛)
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2016-10-31T02:06:22.040
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For any word at all, you should write it the way you've been seeing it in your
reading material. If you try to get fancy with kanji, you should have a good
reason for it based in what you've read so far and your own common sense. If
all you're reading so far is your Japanese textbook, then there you go.
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2016-10-31T02:23:03.427
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Unless you're writing your questions from some time in the past, the answer is
that you should _not_ write こちら using kanji.

This can be seen by going to any monolingual dictionary. For instance,
[goo](http://dictionary.goo.ne.jp/jn/79806/meaning/m0u/) marks the kanji as
follows:

> こち‐ら【×此▽方】

The x means that the kanji is not in the joyo. The down triangle means that
this should not be written this way. Or to say that another way,

  1. in proper* contemporary orthography, 此の etc are never written using that kanji.
  2. in proper contemporary orthography, ちら should not be written with 方 

That said, I think anyone could read it, but no one really writes it.

Comparatively, if you look at entries for 貴方, there are no so much markings
indicating it should not be written in kanji.

  * Proper here means officially sanctioned by the government -- where there are some common uses of kanji that are not, I've never seen anything normal from the post-war period written this way (non-native speaker though).
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Here on Japan we used to write 此方 as formal and there is nothing wrong with
formal, i like it and assume respect, but the real thing is, there is no wrong
or right answer for this.

A lot of times to save time to write when there are complicated Kanji or too
many kanjis on a sentence we just write in hiragana to save time. (not in case
if we are writing a letter to president or high levels of course).
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