Seems easy to me: [name_f]Ramona[/name_f] or [name_f]Phoebe[/name_f]! Both storybook sweet but also powerful, like [name_f]Matilda[/name_f]. I like [name_f]Tilly[/name_f] & [name_f]Romy[/name_f] or [name_f]Tilly[/name_f] & Pheebs.
[name_m]Imo[/name_m], [name_f]Mabel[/name_f] is too matchy-matchy with [name_f]Matilda[/name_f] (unless you’re only having two and want matcht) and [name_f]Amina[/name_f] seems like a different genre but somehow (to me) clashes with [name_f]Matilda[/name_f] because they almost rhyme but don’t.