It's as likely that he kid would get all the bad traits of humans and kitsunes as all the good. More likely, the kid would getsome of each.
There's quite a sizable difference, considering it's outbreeding. The problem with inbreeding is that recessive genes would be more common if the DNA was similar. With outbreeding it's the opposite, where dominant genes are more common, and dominant genes would cancel out matching recessive genes.
Dominant is not always good. Anyways, we're also talking about hybridizing two species.
I'm not against it, just...be wary.
Alternatively, we could turn out to be terribly xenophobic a people, a small price to pay for taking the first step towards becoming The Empire.
Which Empire there are alot of them and some love xenos
Presumably either the Warhammer one or the WH40k one.