Majority of Kodi's addons today is in English. The default keyboard setting for Kodi is English (Romans alphabet). This is very convenient to most of the users.
However, there are some addons that is using Chinese, Arabic language etc, especially Youtube addons that contains almost every languages possible. For example, you can use Simplified Chinese to search for videos with title in Chinese. This is also to videos with title in other languages.
There is a way you can set Kodi's screen keyboard to the characters set that you want, and use it to search video's title in that specific language.