Siblings: [name_f]Adrienne[/name_f], [name_u]Christian[/name_u], [name_f]Emma[/name_f] [name_f]Grace[/name_f], and [name_f]Cordelia[/name_f]. Last Name: [name_u]Frost[/name_u]. Fictional “Universe”: Stan Lee’s X-Men Marvelverse. 
Possible sibling names/names with the same vibe?
Thoughts on the names individually and as a set?
I feel like [name_f]Cordelia[/name_f] stands out a bit as quite different 
To the set, I’d try to add something that balances that out.
Maybe…
[name_f]Adrienne[/name_f], [name_u]Christian[/name_u], [name_f]Emma[/name_f] [name_f]Grace[/name_f], [name_f]Cordelia[/name_f] and…
[name_f]Rosalie[/name_f]
[name_m]Tobias[/name_m]
[name_f]Eleanora[/name_f]
[name_u]Jasper[/name_u]