> or Japanese kana
12-key kana flick input is my favorite input method for use on a touchscreen. Pretty fast and accurate.
Here's a video showing how it's used: https://youtube.com/watch?v=V2B9dgjbQxk
For Chinese, most people in Taiwan use zhuyin which would be difficult on this keyboard without any labels.
At the extreme end, there are older Chinese users who often hand write Chinese on the screen to write a sentence, one character at a time.
In the middle there are many things, like Latin but unusual layout such as French bepo, or Chinese input methods based on shapes, or Japanese kana, or the old T9 that I still see some people using (probably to have bigger letter targets).
A touch screen really ease custom input methods!