Does Inuyasha stay a half-demon

Answer 1

Your question doesn't make any sense at all. First of al Inuyasha was born a half-demon so how can he turn into a half-demon if he's already one. And second InuYasha has transformed into a full blooded demon more than once (but each time he does he begins to lose more and more of himself) and eventually it may/will come to the point where Inuyasha won't be able to tell 'friends from foes' and start to attack his friends too. (And this only happens when his life is in danger that's why Inuyasha and Sesshomaru's Father entrusted Tetsaiga to Inuyasha and Tensegia to Sesshomaru). And during the Night of the New Moon Inuyasha loses his demon traits and becomes human for the night.

Answer 2

Yes. At the end of the Inuyasha series, Kagome wishes upon the Shikon no Tama for it to disappear, ending the decades-long feud between the demon spirits and Midoriko's pure spirit within the jewel. It also removed the only method known to exist in the Inuyasha universe for someone to alter their very being: that is, for Inuyasha to turn fully into a demon permanently.

Answer 3

He sounds the same way except when he changes to a full yukai, his voice might sound a little deeper (But maybe that's just me...)