Okay, so this is a au explanation.

Basically there are home 'isles' that everyone originate from and are very different from one another. Everyone who are born at the same isle have a connection to each other. At least one character from each of my fandoms were born there. For example: Tango from Hermitcraft, or Leo from Heros of Olympus. Here are who were born at each.

Broken Bay:

HoO: Leo and Nico, Nico's mom was visiting family here when she gave birth and stuck around for a few months before going back. Same for Leo.

Voltron: Keith, Kaya, and Kai (The last two are my au), Their mom lived at Broken for awhile and gave birth to the younger three of the family.

Dsmp: Koi/Silent/Solra, They were taken to the Dsmp after their parents died and their siblings wanted her to stay safe.

Hermitcraft: Tango, Impulse, Zedaph, and False, all left after Tango and False's parents died.

Empires: Geminitay and Scott, Their parents both lived there for a bit but went beck to the smp when Gem's mom got pregnant with Fwhip.

Fnaf: Nightmare and Goldie, Their souls lived here but left for a party, met Chris, stayed for a year, then died.

Zodiac Signs: Taurus, Gemini, and Scorpio: All came from here and left for an different world but then died.

Thats the only one I got for ya for now.

Peace.