Berlin's Graffiti Guy?

As you may remember, I found this little graffiti character all over Dunedin while we were living there - click here for details.  He ignited my appreciation for quality graffiti, and now I seem to be obsessed with finding it in my travels. 

While at the East Side Gallery, I found another little yellow character all over the non-mural side of the wall.  We found him four times, and we didn't even walk down that entire side.  People seem to have a penchant for painting over him or crossing him out, but we would still see him. 

Although I didn't see him anywhere else during the visit to Berlin, I'm sure he's hidden around the city.  A good reason to return someday!