Which of these factors, the soul origin, or the DNA complement bestowed on the fetus, has the greatest impact on individual characteristics and traits of identical siblings?

As science has identified, there are many gene-linked characteristics and this is very much on display with physical appearance, and perhaps less so with personality. The reason for the uncertainties here is that the starting point, with identical biology, may be misleading if there is a difference in the soul origin of that life starting out as an identical sibling. So from the point of birth on, differences will emerge and may well be misunderstood or underappreciated for what they truly represent, depending on how profound they might be. They are typically assumed to be the somewhat differing circumstances and exposure to varied experiences over the course of years, where the identical siblings are not present together in exactly the same environment but may be living apart, even in different locations and having families of their own to raise, and so on. The environmental influences have impact in the life experience, in how people are treated, and who they meet, and everything that happens will go into the mix, as well. So, these are not easily separated and meaning assigned with precision to the actual origin, whether genetic or soul-based. In a sense, it is the same. The DNA is a reflection of the soul because it is an imprint of the soul with regard to its makeup to begin with. When there is an identical DNA complement that is shared by differing souls, in a sense, they are made to fit that physical DNA that is apparent. What is not seen is an extra complement of DNA that is interdimensional and much larger in its content and its influences on the person and their characteristics. That will be unique to the original soul involved, and will be identical when the souls are identical for the siblings, but will differ in many respects when differing souls are linked to the identical siblings from the same genetic complement. So, this is something that will require extensive additional research to unravel and cannot be discussed in detail at this time. It would involve concepts and terminology not yet available to human. But the general outlines can be deduced from our description here of the possibilities, the issue being that the DNA complement can be a closer match to one soul versus another when there are identical siblings involved. If DNA is identical, all must share it, so that portion in the physical may be more ideally suited to one of the souls involved but not another. And so, this too will give rise to some differences between the siblings and it will become evident along the way, but taken as a matter of course to be individual choice and learning, leading to consequences that are inevitable, but not appreciated mechanistically for their true origins.