Board Thread:General Discussion/@comment-28885320-20160711182624/@comment-27701762-20160711203934

The simplest answer would be the SOUL trait one: Frisk's characteristic trait is determination. Obviously there's ongoing discussion about whether determination is, indeed, the trait that belongs to the red SOUL.

Another response could be that Frisk is just more fortunate. It may not be the case that the other children died because they lost the will to go on, necessarily, but they tried to move on and failed in one way or another. They fell into pits or traps, or encountered enemies who were too strong for them to overcome.

The thing that constantly throws a wrench into these explanations is that the other children seemed to have some capacity to save and reload. But it's unclear what power they actually wielded. Did they actually have the same level of control that Frisk does, or could they only make tiny manipulations? I tend to fall on the latter explanation, since you otherwise need some special explanation about Frisk's willingness to press on, which doesn't make a whole lot of sense. However, this explanation relies on the red SOUL trait being determination.

I don't see any other way of solving the problem, though, other than throwing our hands up and saying that Frisk is the one who is more determined because they're the one we play as.