I love Karui!She and Sakura are my top favorite characters!! Though I never thought or saw of this pairing I think it's good since they kinda remind me of NaruSaku and Karui did mention wanting a boyfriend in Konoha.
Btw did those two meet in the manga/Anime?Did I miss anything?
I'm not really good in explaining those things. Karui has a fiery spark and self confidence that could work with Kiba's hot temper. But I think they will also have their sweet moments. Besides Karui mentioned finding a boyfriend in Konoha xD