Zombie Fairies aren't really zombies, they are Ghost,
Ref - https://en.touhouwiki.net/wiki/Zombie_Fairy

A Zombie Maid Fairies aren't actually undead, they are Spectral Fairies found rarely in the nether, if a Normal Maid fairy ends up in a nether, she'll slowly transform into a Zombie Maid Fairy, just like how Piglins turns into Zombified Piglins outside of Nether

A Zombie Maid Fairy has a Firing frequency amped to 0.25% and is a little harder than the regular Maid Fairy, and if killed can drop some Power points. Zombie Maid Fairies are immune to fire however.

Good idea, considering it

Possibly a Kedama, a Ghast-equivalent Fluffball youkai mob, but small as 1 block and it'll start firing danmaku when being seen from around 30 blocks away or at the same attack range as Ghast. Kedama can still be harmed by fire. When killed, it will drop Power Points.