berserker_(sensha_otoko)_(fate)
Fate/Zero's Berserker (fate/zero) as depicted in the Sensha Otoko April Fools joke for 2009. In this universe, he goes by the online username "U to O", and is a helmet-wearing man who fears facial exposure and eye-contact. He uses his sketchbook to write his speech and thoughts, and is actually a nice guy.