An edit: Random Wikipedia delving the other day informed me that the snipers trained by Vasily Zaytsev were called zaichata ("bunnies"). Toying with calling a couple of kids some variety of "bugs", if it's even the sort of thing you could call kids. (End edit.)
And while I'm here, mentor-guy has a young niece with the name/nickname Candy. Anything cute and plausibly Russian she could be called? Some work with Google suggests Konfeta (or Konfetka?) to me. Also, since the circumstances of her birth were... somewhat unusual (mad science ahoy!), how likely is it that her (also Russian) parents would just flat-out name her Konfeta-or-whatever once the adventure settles down and they get around to naming her? They're globe-trotting types, but would likely raise her somewhere near her babysitting uncle, if living in the US helps the kooky names factor any. I'll settle for Candy, though, if Konfeta would be the Worst Name Ever - though some of my characters do end up with some odd names, so I'm not opposed to a name that makes people go "well, it works for a fictional character..." or such.
(Icon, aside from being of a Russian character, is unrelated.)