Special (non-english) character in name. What to do as author? Internationalize or not?
First of all, always be consistent. Whatever you decide, that is what you will always have to use.  

Considering the first point, might be better to strive and use your real name as it is with the non-english characters. You will have less problems in the future to prove your authorship in case questions rise. Complain to systems who do not accept your non-english characters...