[name_u]Vivian[/name_u] or [name_f]Vivienne[/name_f], [name_f]Lucia[/name_f], [name_f]Marina[/name_f], [name_f]Natalia[/name_f], [name_f]Lorelei[/name_f] and [name_f]Elena[/name_f] all come to mind as rather elaborate, lush polysyllabic names in the same vein as [name_f]Cassandra[/name_f]. Most of them (the last 4!) had a bout of popularity in the 90s!
[name_f]Corinne[/name_f] and [name_f]Esme[/name_f] don’t have the -a ending. These more tailored endings could play with a strong, ambitious city girl archetype.
If these aren’t suitable, maybe we could know a bit more about the character!
~[name_f]Happy[/name_f] hunting~