Mister E
I have gone by this name for years.
I entered Melee tourneys with this name, and it will always be my alias for Smash. My tags are Mr.E and MstrE.
It means more than one thing. First of all, growing up I distinctly recall something my parents would often tell me- "You are an enigma to me".
Mister E can mean Mister Enigma, but no relation to the Batman villain.
Simultaneously, and quite interestingly, it phonetically makes you say the word "mystery".
As if that wasn't enough, Mister E can also stand for Mister Epic. Who doesn't like Epicness?
FYI- My last name doesn't start with the letter 'E'. I kinda wish it did. =P