so basically, voltero had a sister he never knew (he was like 2 at this time) and she died from a mysterious genetics defect at around 14. knowing the possibility of this happening to Volt his parents hired a witch to cure him when the time came. once volt was 13 he felt the pain from the defect, the witch arrived and turned him into a mimic slime so that he could adapt to the defect. but as you would learn he got more than just the ability to adapt