They were a couple of whiz kids who met in an after-school gifted program. One day they were messing around with a teleporter they built out of household appliances, and one of them forgot to wait for the other to get off the receiving platform. They eventually got used to their condition, and now they’re all grown up, and they have PhDs in astronomy and particle physics, and a Master’s degree in culinary arts.

They each have their own separate consciousness, but they can “hear” each other’s thoughts. Control of different parts of their body isn’t fixed in any way, and some parts they swap control between them. Brent, being the more athletic of the two, takes control of their whole body whenever they go out biking or running or doing any other sports. Ryan plays about a dozen instruments, including guitar, piano, and saxophone, and sometimes Brent joins him on piano, each of them taking a hand. They only have one mouth, so they have to take turns speaking, but their voices are just different enough to tell them apart.