Meet XL-12 aka Sylus
It started as a joke. There have been certain tribes in history where a child reached the age of adulthood where there would be a ceramony siginfying them as Women and Men. At that point they would choose a name that represented who they are.
I mused that we're all tattooed with our names at birth whether we like our name or not. So the joke went, everyone could be called XL-12 or EE-17, Yit-86 or whatever then at their 21st birthday they get to pick the name want.
So XL-12 was born then turned into an ongoing Halloween character and a SiFi story that I work on when I'm in the mood.