@myconidiosyncrasy it started out as nerd shit when I joined Telegram, taking 0x52 as the ascii value for capital R and using that.
I started there with a profile picture of a fox, so with input from friends it became f0x52 / friendly fox / f0x
where I still mainly use f0x as a username or f0x52 when that isn't available
fuchsia came much later, as a more feminine version given by a german friend, with fuchs also being German for fox