Poppo is about as awful as I would have expected. I guess FBF couldn't afford Danny DeVito, because that's what my first choice was. They probably didn't pick Peat because nobody likes male Juusus except for maybe NoName.
Overall all of the voice packs end up using higher-pitched voices for characters than I expected. I'm okay with Fernet's though. I was expecting the lower-pitched ohohoho type voice but it seems like she's more of the uppity princess type. Not bad either way. Yuki could have been deeper as well, but it's still fine for her.
I don't like Hime's voice, so that means that it's working as intended.