Y. he is yellow.
Y is one of the lamest, least renown, most awesome (not for real), and lowest-ranking members of ABCDEFGHIJKLMNOPQRSTUVWXYZ. he was born as a V, but then he grew a tail due to some mutation caused by too much exposure to Barney. Y is now always picked on by the cooler letters, but he deserves it because he doesn't know 2+2.
Y is a chef for reasons we do not know. Y also likes to ask "WWWWHHHHHYYYYYYY?!" (obviously), and has been shot for screaming it at one point, causing him to scream it again, causing him to get shot again, etc. Y is currently hiding under a rock.
You can blame him for being male, as he is your Y chromosome, and you can also blame him also for being evil in mathematics alongside X.