'Bobby' was definitely the first child with some 'sense of self' with a developing understanding that they were different and needed to learn to behave in a specific way to 'fit in as normal'. They answered to the name of the body as it was back then, but did not have a developed sense regarding whether they were boy or girl. As they experienced growing up mainly within the Inner world with their changelings (who have no specific gender) they have chosen gender neutral pronouns and have finally decided they prefer the name' Bobby' as their 'chosen name'
I believe the 'changelings' came from Bobby's imagination possibly seen on an early sci-fi TV series. This is validated by the fact that all the changelings see Bobby as 'the original child' and see themselves their Guardians. (as if they were a 'royal' child)
Little Susie seems to have started life as Bobby's 'child social mask' for play school and then school up to a certain age. LS never seems to age beyond 7/8 years old. I'm not sure why? Over the years her personality and sense of self developed more fully and she now appears to be a full seperate child alter. She identifies with the original name possibly as she was the one who had to put her hand up in class when teacher called children's names out for registar. Though she chooses the shortened family nickname rather than full (original ..its been legally changed since) christian name.
Phoenix would help both Bobby & Susie and both could 'see' (in the inner world) and talk to/communicate with Phoenix. They are changeling also gender neutral) so has never taken full control of the body. The bond between those three seems to suggest they were the original 3 to work together from the earliest years.
I am still piecing together the years between 10-15yrs old. Teen S (Now 'Yuna') is often 15 so may have been around also since beginning of puberty, I know 'Sioux' was present for some of the teens as a 'social mask' from who she remembers as 'friends'.
it's possible Teen S/Yuna split off from 'little Susie' if she decided she didn't want to be any older? I [Kit] was a direct split off from Bobby who couldn't cope with the autism unit after Thea's persona 'dissolved'. This happened after understanding our difficulties understanding people was due to auditory processing from Autism rather than being severely deaf. (Thea had been a 'culturally-deaf' sign language user who only came out in presence of other deaf sign language users or interpreters).
so me [Kit], Teen S, little Susie and Bobby appear to be 'the core personalities' who have remained throughout life but hidden behind other 'social masks' to be able to achieve college, university, work etc which 'Thea' & 'Maddie' took care of. They seem to have had no knowledge of the inner world and none of us could communicate with them directly although we could 'switch out' or 'watch from the back' and influence their subconscious thoughts. As they lived with others though and were often busy we very rarely got chance unless they returned home for the weekend or holidays..which would automatically trigger a switch.
We didn't really come out and stay out regularly again until 'Maddie' became housebound and could no longer work and social commitments became less. First just myself then the others starting to join me once 'Maddie' had been returned to the inside unable to cope and we had full control of the life. Then because social appointments were so few and far between one of us 'insiders' would act as host rather than the system assigning another social mask with no awareness of us all to take care of all daily life. Maybe 'myself' is then made up of 4 core parts? ... with some past 'social masks', and 'the changelings' who have played imaginary playmates for our littles to 'comforting spiritual forms' for older adults?
'Jay' appears to have had a 'secondary host' role in 'Thea's era' so has some memory of sign language (though hasn't used it for years) but also curiously has memories of playing a piano and knows how to read music! I'm not sure if she was originally split from one of 'the core' members or evolved somehow via other sources! She appears to have no trauma memories

I wonder how you others on the spectrum organises itself over the lifetime to 'get through life'? and if you know of your alters origins???
Kit