If you're near sea, Sirens are a great choice. By mythology, they should be similar to Russian Rusalkas, though less aggressive.
And for my contribution to Baba Yaga/Jaga variants, we have Baba Roga who haunts mischievous children and has veeery long nails that leave marks on their beds as warning before grabbing them as prey <3
Also, Kuman Thong as a guardian spirit, though it has a high chance of back-firing so it would be good to use it as a curse.
Grimm dogs as well, for animal types, though they're highly territorial.