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It caught my attention the character 伍 with the meaning of "five".

I've seen it recently in the anime "Demon Slayer: Kimetsu no Yaiba", in which
some characters have kanji tattooed in their eyes. There is one that has 下伍
indicating he is "lower five" in rank.

Why 下伍 and not 下五?
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2020-07-17T07:58:07.853
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2020-07-18T09:08:25.270
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question
kanji kanji-choice
If both 五 and 伍 mean "five", when should I use each one?
I believe its a formal kanji used in legal documents. Also I read that its a
jinmeiyō kanji, a kanji used for names.
<https://en.m.wikipedia.org/wiki/Jinmeiy%C5%8D_kanji>

The author probably chose to write more formal and older kanji because the
story is set in the Taisho Period. Thats just my guess.
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2020-07-17T08:29:31.167
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2020-07-17T08:29:31.167
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伍 was used to prevent falsifying the accounts. Such older notations are called
Daiji (大字) in Japanese (see Wikipedia in Japanese
[大字（数字）](https://ja.wikipedia.org/wiki/%E5%A4%A7%E5%AD%97_\(%E6%95%B0%E5%AD%97\))).
In formal, in Japanese law only allowed to use 壱、弐、参、拾 (one, two, three, ten)
and other characters like 肆, 陸 are not used now.
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2020-07-18T07:59:55.677
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2020-07-18T07:59:55.677
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伍 is an alternative Japanese numeral that is used in formal documents. This
documents can include legal documents. When they are used in legal documents,
these set of numerals can prevent contracts, checks, and other documents from
being changed or manipulated after printing. For example, the standard kanji
for 1, 2, and 3 can be incremented up by the addition of a single stroke.
Therefore, more complex kanji like 壱 (one) are used to prevent this practice.
We encounter the same problem with Hindu-Arabic numerals in English, so we
parenthetically spell out the number in English for the same effect. For
example, “the merchant agrees to deliver 2 (two) units to the customer.”

There are, however, other uses for these kanji. They have a certain cachet to
them. They are old-fashioned and formal, perhaps a little more Chinese than
everyday numeric kanji. In the manga you saw it in, it probably is meant to
look cool. Being set in the Taisho period may have contributed to this style
decision, and furthermore the “coolness factor” is applicable even to stories
set in the present or future (e.g. Neon Genesis Evangelion).
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answer