@Kai: Ehhh, well that certainly is a theory. As long as you understand that the original Impa isn't alive, that's fine with me. If he's going to be a descendant of such a reincarnated "Impa", however, just understand that that's one particular NPC I will likely be using later on. So even though she's closely related to Idrina, I would prefer that you not make use of her. Not without PMing me about it at least. (Like, "Hey, Idrina wants to talk to his mommy... can we collab a post?" That sort of thing.)

"As a Sheikah, Idris has a certain need to [b]move quickly[/b] and [b]function effectively[/b] in situations of pursuit. Through practices of obstacle courses and active duty, Idris has developed skill in [b]fluid and quick movement[/b]. Parkour has become a skill which he has developed to a fairly decent degree. He has spent the good part of his life, since he was fourteen, developing his ability in parkour, as such his body is conditioned to the point where it is convenient for such movements. [b]With aspects of the environment being either high up, or very small area platforms, balance becomes an important aspect of parkour. In most cases, Idris will be able to keep balanced on surfaces. He has a good degree of balance where he could walk on something as thin as a railing and have no problems. Functioning well in the condition of small surface areas to walk on, as well as the quick speeds at which he functions. In an environment where he will be undisturbed, Idris will be able to keep his balance during parkour[/b]"

All of the bolded parts pretty much just sound like the definition of parkour to me... thus contributing to the kinda non-brief description, which is what I'm mainly looking for. The [url=http://en.wikipedia.org/wiki/Parkour]definition of parkour[/url] is literally just getting from point A to point B as fast as possible. Scaling buildings, jumping across platforms, and being fast and agile simply fall into that simple definition by default, I think. In essence, I'm really just asking that you narrow down the length of the description a bit. 

I still feel like "Shiekah Training" would envelop a whole lot more than just agility/speed/stealth, though. "Shiekah Training" sounds like... well... just like it sounds-- everything. Saying you're skilled/talent at your training doesn't seem to effectively communicate what your skill/talent really is. I don't really think of a simple combination of agility and stealth when I hear it, but... maybe that's just me. Do as you will with that one.