[name_f]Pandora[/name_f] is the only one I don’t think is usable here. [name_f]My[/name_f] reason? I’m a Greek myth nerd, and [name_f]Pandora[/name_f] is literally the worst. 
[name_f]Valentina[/name_f] is a bit posh and frilly, but it can be shortened to [name_u]Val[/name_u], [name_f]Tina[/name_f], [name_u]Lenny[/name_u], [name_m]Alen[/name_m], etc. if you really want to. And anyways, it’s not so unusual.
[name_f]Rosamund[/name_f] is totally useable. I personally don’t get how anyone could say it’s masculine! It’s in [name_f]Jane[/name_f] [name_f]Eyre[/name_f], Downton [name_u]Abbey[/name_u], and other classics. [name_f]Rosalind[/name_f] is pretty, too. They’re both sweet.
[name_f]Bernadette[/name_f] to me is very cute and unique! I don’t think it’s too old-fashioned. [name_f]Bernice[/name_f] is, but not [name_f]Bernadette[/name_f].
Emmadine I’ve never heard before, but I think it’s useable!