I've been plural since I was 16. Through browsing on the internet, I came across the concept of tulpas, and shortly after I decided that I felt lonely enough that I wanted some company in my own head. Incidentally, one of the reasons I got so good at english was because I would talk to them almost entirely in English, instead of Spanish. Then, about a month later, I felt a different pressence while I was in class, and I decided to name her Catherine, after a character from a book. And things have kept going from there, the group steadily growing mostly due to my tendency to get obsessed over a piece of media.
I already have a PluralKit, but I hope that this page will serve to expand on it a little better, and to give a small space to those who want it.