Well's mine's is literally not as far as interesting for spanish people but:
When i was like 9 or 10, i wanted to be a Youtuber using a voice synthesizer (Known as "Loquendo", pretty popular in hispanic and a bit italian too), after lots of unoriginal names, i got "NicoMario70" because i liked how it sounded like in spanish and I personally don't like to be referred as a nickname, Mario due... duh it was my fav franchise at the time then and 7 is my favorite number, i got onto the Countryballs comunity and then i created the first """OC"""(at the time idk that i just created a oc during those years) ever which represented me during 2018:
I dont have the original image but it looked like this:
So yeah, basically imagine there is a Country where his flag is literally a RANDOM MARIO PNG IN A BLACK BACKGROUND and there is a Ball of that... how hilarious and cringe was that
Ok but back to the original purpose, Remember when i said i was gonna to be a Ytuber with it?. It of course failed but i liked to be refered as that name and the OC image.
Then i got into Discord and there is not much to say, other than at the time i created an OC named "Shurinoku" I put her as my PFP and during August-October?(maybe) i was known as "Shurinoku San"(Fortunately, the last cringe thing probably).
But everything Changed in Someday December 2021, I decided to do two things, Change my OC design to this:
Yep, my actual persona now at days, BUT More importantly my nickname... "NM7 (Nico)", just a abbreviation of my past name, however is more easy to remember and my actual name is on this too; as i said, because i dont like to refered with a nickname.
I still use that name in Youtube for example, so were "Netsumu" comes from? Short awnser, it's a japanese play of words of "Internet" and "Seven" , i decided to use that name mostly on Non hispanic communities outside my mother language (except the Bomberman community).
And there is me... Not expected to be that long but here we go.