final_kunoichi48
umm first they were born like that and second she umm i think is speical because she is the ultamite umm declonius and not sure maybe it was because she was a project and had to be used so more she trained or what ever it maybe got longer or she was just born with it that long not sure
Mariko is nowhere near the ultimate diclonius. The ultimate diclonius is Anna, she is the most powerful diclonius, so advanced that her head is the size of a small lake and she can basically predict the future to a base extent.
I don't know if and how many vectors she has, but believe me, she's called the goddess for a reason.
Diclonius get their vectors from a mutated enlargement of their pineal gland, a small gland in normal humans that is much bigger in diclonius. Nana "turns off" vectors by disrupting the pineal gland, in this case its not actually done through pain as most people believe, it is the pineal gland being "turned off" that is painful. However pain DOES disrupt a diclonius ability to be use their vectors.
Inochi was right in saying that as generations progress the power and number of vectors increases.