1001 Video Games
appears in the book 1001 Video Games You Must Play Before You Die
by General Editor Tony Mott.
Even though the character's name is printed out as "U-1", and everyone calls him "You-One"... his real name is "Yuuichi". 1 is pronounced as "Ichi" in Japanese. "U-1" is a nickname given to people named Yuuichi in Japan, so this little detail is just a badly handled localization.