FontLab's TransType can generate color fonts in various formats using TTF, OTF or VFB( FontLab) layers in as input. But currently there are some critical bugs that prevent them from being commercially releasable so I'm waiting for a new version—probably 2020 or 2021.
Here's a chart of the Cyrillic set from 0450-04FF with, what I believe are rare glyphs* highlighted in white. For me, the darker characters are must haves in any typeface with Cyrillic support as they're in common use in living languages.
* historical, scholarly, biblical transliteration and such.