I really hate drawing straight lines. We had to do it in school drawing class, and I always got dinged because my lines weren’t perfectly straight (I prefer curves). Every time they told us to draw straight lines, I let out one big MOAN (ichi moan). Not just any MOAN, the biggest MOAN, the ICHI ban MOAN, or ICHI-MOAN for short.
Likewise, I really hate remembering this Kanji. Every time I get is wrong, I let out one huge ICHI MOAN.
I’ve slightly mistyped it so many times that I let out a huge MOAN every time I see this word. This truly is the #1 kanJI for moans, the ultimate ICHI-MOAN-JI
Here’s another mnemonic (if you can call it that).
一 is a straight line. 文字 is a letter. 一文字 is a straight letter, also called a line.
BTW it would probably be 1つ moan (or some other counter. Counters are the death of me.)