Once upon not long ago there was a cray cray science woman called Doctor Oluwakemi Akinwale but everyone knew her as Krazy Kemi. She did many science and loved to do huge big experiments with genetics and was a leading researcher in the GMO industry (that's genetically modified organisms).
She was a mad scientist and did lots of crazy experiments with GMO things and loved to try and create organisms from one cell. She liked to experiment on human cells because who cares about ethics. But she went too far and oops she created severely mutated human boys and they were called Alex and Haydn.
Alex unfortunately aged very drastically because he didn't breed too well and Haydn was disliked by many people and despite having fully functional sexual organs he could not reproduce with another human because no one wanted to. Krazy Kemi wanted to help her mutant creation and GMO'd the heck out of him and boom he has the very unique ability to reproduce with himself.
That's good because no one else would.
But Krazy Kemi did not foresee that genetics do very weird things if someone just does the do with themselves.
Haydn birthed a human that he thought looked like an ellaphant which was explainable because genetics are weird. She was called Ella because he wasn't very imaginative but now he kept having concerns for Ellaphant so he pledges no more children. He will never reproduce again because no one else will.