Can I help, please?
The word is Hanzi (chinese original language and meaning:
Han=chinese, zi=sign, note), by the way, and
they are the origins for other countries, not the japanese Kanji.
The Japanese took it over from China, left, what was usefull and also reduced some to their better understanding when they created their own systems.
One by Kobo Daishi, also known as Kukai, who invented the first own writing system in Japan, the Hiragana syllable system, whose signs are still easy to relate back to the Hanzi, but fitted the own system more clearly, while the Hanzi, now called Kanji in japanese, as long as they still made sense, simply additionally remained.
To this, much later Katakana was added, which helped integrating foreign words and meanings. Also Katakana still is an even more simplified version of some original Hanzi.
Thus, there is a certain red line between them all.
As for Kobo Daishi, aka Kukai, see for example:
Kūkai - Wikipedia
and
Kukai - Everything2.com
And by the way, no chance to make them give it all up, gladly, its also the base for and beginning of art and visualisings.
Greetings!
(I hope, I have not mixed up Hiragana and Katakana once more, which sometimes happens, if so, just switch the names)