Who is the German speaking woman?

Hi, I am so glad I found this forum. I am a long-time Gaki no tsukai ya arahende fan but finding this forum and so many other fans outside Japan is really cool. I can’t wait to read through all the threads when I have more time.

I am from Germany, so of course I am curious if anyone has more information about that German speaking woman that turns up from time to time (like in Yamazaki’s theatre play in June) ?

Is she an actress? How did she get involved in Gaki no tsukai? Does anyone know her name?

Thank you guys!