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Due to a limitation in the current Pygame SDL, renpy.input() does not currently support the input from an IME (used to input Chinese, Japanese, and many other languages); it is also impossible to enter characters that appear in Latin-alphabet-based languages like Spanish and French.
One way to circumvent this limitation is to use the SoftKeyboard framework, which provides a software keyboard that allows the inputting of special characters, symbols, and characters from other languages. There are also Cookbook pages for a Kana Converter (romaji to hiragana/katakana) and a Korean Inputter.
Another way is to have the user edit a text file and then to read the contents of that file in Ren'Py. The procedure is outlined below.
First, make a small text file containing the name of your character and nothing else. Make sure that the name is the only line, then save the file as UTF-8 in the game directory (where the script would be.) Mark it clearly so that prospective players can easily find it.
Next, insert this code into the init statement of your script:
$ nameVar = file(config.gamedir + "/Your name.txt").read().decode("utf-8")
Declare the named character like so, placing the name as the variable nameVar:
$ a = Character(nameVar, color="#c8ffc8")
If you need to insert the name into someone's dialogue, use %(nameVar)s to do it.
Also, include simple instructions telling the player how to alter the text file.
Of course, this procedure is not only limited to character names. It can be used to put in any kind of text.