It is a dummy character of penmanship not readable to read.
When it is troublesome to draw scrolls and Japanese texts that appear in the picture, and do not need to be read. Stupa?
You can also feel a bit of horror.
It is Aekyung that the same character is occasionally continued.
読めそうで読めない習字のダミー文字です。
絵の中に登場する、読ませる必要のない巻物や和系の文章を描くのが面倒なときに。卒塔婆なんかにも?
ちょっとホラーな雰囲気も出せます。
たまに同じ字が続いてしまうのはご愛敬…