Totally smart! :3 :gives you cookie:

Well, this may be a little spoiler like, but it's not so much part of the overall idea

1/3 = 33.3 %
1/4 = 25%
1/2 = 50%

Shiori and Inuyasha are half, thus approximately 50% youkai, human. Let's remember this is all more or less because this is an array of genes, punnett square and that.

In my story, Hion's purity is in the range of 1/3 to 1/2. This is why he's so strong and has managed to live for so long. His siblings, Shiori and Inuyasha had three, they were more on the range 1/4 to 1/3 and as such they were more 'human' and they mostly live a normal, human life. They are both dead, in the story, I mean.

I believe Hion has both inu and bat innate abilities, and because his youki is strong he can use most of them. I dont think he can assume a beastial form because his youkai is not enough, but he can draw bat wings and I'm sure he can use Blades of Blood and such.

Did this help? More or less?