Koumyou's not alive-alive, but the fannish suggestion a ways back that Nii had somehow incarcerated his soul in the rabbit sounds ominously close to what we see here. Clearly a specter is haunting Nii Jen'i, but since Nii /is/ Nii one doubts that a mere specter would do it. Or else Koumyou is his one weakness. 'I (or someone) killed you but you're still around.'

I doubt Nataku's been reincarnated. Itan don't, do they? if we go by Homura. He's the one character I might just see Minekura using in the main series, since she likes him so much.