I'd like to say Oscar or Grover.
But then again, I also often feel like Sully, since a lot of people tend to interrupt me. And yet I feel I have the know-it-all aspects of Biff... And I sort of feel like Bruno. At my job I often have to carry fairy heavy things around, and I often don't feel like talking when doing so. And I tend to feel like imaginary-era Snuffy... A lot of times I feel people aren't noticing me when I'm around. I can be behind or near somebody a bit, waiting for them to notice me before talking (I don't want to startle them by talking without them knwoing I'm there... I hate it when people do that to me).