I like
Opal. It's warm and weird. I like it as both a first and middle name - it's a nice, unexpected pick in either case. I do think of "Opples and ba-no-noes" like from the children's song, but I still find it a really satisfying name. I'd love to know a person named
Opal.
Opal Athena is baroquely gorgeous. So creamy-beautiful and imperious - it's my favourite out of your creations.
Opal Rosalie I find less pleasing, I think because of the similarity of sounds in the start of both names - Opa- and
Rosa-.
Opal Rosaline (ROZ-a-lyne) would be better to my ear.
Opal Marietta is fun - it makes me think of the word operetta, which is a fun, dramatic word, and the combo has a really nice blue-black-and-white palette.
Opal Anais is a bit cold and lacking in personality - too many vowels, I think. It's like nothing is holding the combo together.