I recommend a great workbook for learning Kanji 漢字 to people who are learning Japanese 日本語. A unique thing about the workbook is that the sample sentences includes Kanji.
All sentences are about poo-poo.
The sentences sound funny, especially for kids. So that makes studying Kanji a bit easier since it is funny and easy to remember.
Poop Kanji Workbook (Unko Kanji Drill) うんこ漢字ドリル
for 1st grade to 6th grade of Japanese primary school students