What inspired YOUR username?

I just tried to think of a cool character and I came up with Iggy. Because I didn't want to just be "Iggy Koopa" and all my usernames are AwesomeRob64, I just thought Awesome Koopa.
 
I keep using the same username for every website.I started this username name on youtube. I like Sonic, I live in a city,and the 08 are just some random numbers.So, "Soniccity08"!
 
As for my new name, MKGirlism:
MK = Mario Kart (my favourite video game series).
Girl = My gender.
ism = Something random YouTube added on the very last second.
 
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Herpity Derpity, if you have played Doki Doki Panic or Super Mario Bros. 2. No explanation for my name.

Does gasmaskes really shoot bullets?