Unfortunately you only have this one toon´s name... I would say your best bet would be to post your search in the German forums and hope that he (or one of his other friends) reads it and remembers. I know some German forumites with toons on English servers, so there is a certain chance...
If you need someone to translate your post you are welcome to PM me. (Although you could also try the Google translation tool. It´s always good for a laugh. Worst translations I can think of. 
)
If it has eyes, you can blind it, if it has blood, you can make it bleed, if it has a mouth, you can make it scream.
If u havent tried it already go to global ignore and type in his name and it should come up with his global then try unignore him then try and send him a global request. hope tht helps.
Last year I played on Union with a guy from Germany with his toon Kagemusha. I took a 3 months break and when i was back, i couldnt find him anymore. Is there way I can track him(if he is still in the game)?
P.S. I dont have him in Global Friends