Ok, so I would split my name into the following parts: Imperial, Gamer, and 517, since they have different stories on how I chose that individual part of my nick.
Imperial - It all began with my YT channel (Pls sub btw), and I was looking for a new logo for my YT channel, since I was tired of using my favorite Pokémon Bisharp’s head as the logo. I then started searching online for cool gaming logos on placeit. Eventually, I found this cool looking logo (my Smogon account picture), and I decided to use it. Since you were able to edit a logo on that site, its default only had Imperial, so I decided to go for Imperial over any other prefix.
Gamer - At first, I decided to use Pokémon in Gamer’s place, but then I decided that I would do YT videos that aren’t Pokémon, so I decided to use Gamer to mean all games in general.
517 - I used a random number generator between 1 and 1000. I got 517.