/usr/share

I wouldn't go for lowercase Cyrillic characters simply because most of them won't fit well enough. But here's some alternate characters (mostly based on those used in handwriting or italic...

 It's a 14-segment display, since the top and bottom horizontal lines are not separated in the middle.

Can't really make an Ы any other way when the lines aren't separated. (In fact, the actual LCD14 font does the same.) These characters were meant to display an "alternate"...