What inspired YOUR username?

Actually, everypony wasn't made up by the bronies. It's in the show.
 
Wiki:
I liked the Koopas of the Koopa Troop, and since I didn't want it to be Koopa Troop, I got rid of the space.
Forum:
My name was originally KoopaTroopa, because KoopaTroop was taken.
 
For all my names I had:

BabyLuigiOnFire: My favorite character is Baby Luigi and I wanted something sounding crazy do go along with it, so my sister proposed the fire part and it stuck on ever since.

Cosmopolitan: Tribute to the Fairly Oddparents and Cosmo is one of my favorite characters in the show. I thought that was a great punny name.

Baby Luigi Lacertae: Base on the blazar, BL Lacertae, I'm pretty fond in heavenly objects in the sky such as galaxies and nebulae. Guess what I substitute the BL for, eh?

The Magic School Bus: One of the shows I really enjoyed when I was a kid. It's so nostalgic I feel like putting it up there.

Baby Luigi: I think it's a more simplified version of "BabyLuigiOnFire" (though many refer to me as BLOF) but I think it's a very suiting name anyway and especially since it's not taken yet.
 
Baby Luigi said:
For all my names I had:

BabyLuigiOnFire: My favorite character is Baby Luigi and I wanted something sounding crazy do go along with it, so my sister proposed the fire part and it stuck on ever since.

Cosmopolitan: Tribute to the Fairly Oddparents and Cosmo is one of my favorite characters in the show. I thought that was a great punny name.

Baby Luigi Lacertae: Base on the blazar, BL Lacertae, I'm pretty fond in heavenly objects in the sky such as galaxies and nebulae. Guess what I substitute the BL for, eh?

The Magic School Bus: One of the shows I really enjoyed when I was a kid. It's so nostalgic I feel like putting it up there.

Baby Luigi: I think it's a more simplified version of "BabyLuigiOnFire" (though many refer to me as BLOF) but I think it's a very suiting name anyway and especially since it's not taken yet.
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Oh god that was an awesome cartoon back when I was little. *nostalgias* Also, I've not heard of a blazar before. I'll have to do some research on it. Space is just very interesting as a whole.
 
Peter Sam said:
Toad85 is a mixture of my favorite character, Toad, and the year he first appeared (1985).

Toad2012 is a mixture of Toad and the year 2012.
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Elaborating on this:

Peter Sam -> My favourite Thomas character.

Doofenshmirtz Evil, Inc. -> I have no clue why I chose this name; I guess it was because my bro was into Phineas and Ferb at the time?

Vlad Plasmius -> UM made a beautiful Vlad Plasmius pony, and I just decided to make it my theme. I was considering "Vlad Plonyus," but I considered it too stupid.

ghostyTrickster -> John is my favourite Homestuck character, and P_Y was using ectoBiologist, so I just took John's former chumhandle.
 
Marstar2000: I guess I just like Mario.

A New Super Christmas: Christmas theme.

Let's Go 8-bit: I was playing Kirby's Adventure (Virtual Console [On the Wii]), and I thought about it being on the NES, and my liking to it, so I thought up the name: Let's Go 8-bit