If it's a warped fic, then Wary sounds very suitable and very Sirius. (I forgot Dangermouse as well, which is on the same lines. And congratulations on making me go to sleep thinking about mouse names, there's not many people who could do that, LOL).

A controversially pregnant Barbie doll?! I miss out on these things not having kids, but perhaps it's as well in this case. Whatever would Sindy think... ;)