hello!! just a heads up: this is an ask dedicated to providing scientific proof behind endogenics and whatnot. if ur not interested, feel free to delete this. also, endogenics do not claim you can have a trauma disorder without trauma. being plural and having a CDD are actually different, and many endos agree that you can not have DID/OSDD without trauma :3c
NOW, here are some scientific studies documenting cases of plurality through non-traumagenic means (with links to PDFs and dropboxes at the bottom):
"Critiquing the Requirement of Oneness over Multiplicity: An Examination of Dissociative Identity (Disorder) in Five Clinical Texts." - Kymbra Clayton, Department of Psychology, Macquarie University
"Comparison of Brazilian Spiritist Mediumship and Dissociative Identity Disorder" - Alexander Moreira-Almeida, MD, PhD, Francisco Lotufo Neto, MD, PhD, and Etzel Cardeña, PhD
"Transgender Mental Health-American Psychiatric Association Publishing (2018)" - Eric Yarbrough, American Psychiatric Association Publishing
https://www.dropbox.com/scl/fi/pvu74xz0zsx73c5k9uant/Eric-Yarbrough-Transgender-Mental-Health-American-Psychiatric-Association-Publishing-2018.pdf?rlkey=d7s032i8t2r8wldqjgygyuh3f&e=2&dl=0
https://www.dropbox.com/scl/fo/j7lhgaunt49yn6afclgz0/h?e=2&preview=Comparison_of_Brazilian_spiritist_medium.pdf&rlkey=lpvsll0ajwfv376mhuqmwtx16&dl=0
https://drive.google.com/file/d/1hcMLBTc41yu8PXL_oW4MieSwlLxPCPT3/view
If you would like for me to provide quotes that I have found through my own readings, I definitely can!!