I have some suggestions I like but struggling to create a sibling set, not sure which ones fit together. Twin girls, a girl and a boy.
[name_f]Aurelia[/name_f] [name_f]Elizabeth[/name_f] [name_u]Kingsley[/name_u]
[name_f]Vienna[/name_f] [name_f]Pearl[/name_f] [name_u]Kingsley[/name_u]
[name_f]Dulcie[/name_f] [name_f]Matilda[/name_f] [name_u]Kingsley[/name_u]
[name_f]Violet[/name_f] [name_f]Noelle[/name_f] [name_u]Kingsley[/name_u]
[name_f]Arlette[/name_f] ‘Letty’ Maiselle [name_u]Kingsley[/name_u]
Luciana/Lucia [name_f]Rose[/name_f] [name_u]Kingsley[/name_u]
[name_f]Melody[/name_f] [name_f]Scarlett[/name_f] [name_u]Kingsley[/name_u]
[name_f]Heloise[/name_f] [name_f]Noelle[/name_f] [name_u]Kingsley[/name_u]
[name_u]Atlas[/name_u] [name_u]James[/name_u] [name_u]Kingsley[/name_u]
[name_m]Eric[/name_m] [name_m]Thomas[/name_m] [name_u]Kingsley[/name_u]
[name_m]Kasper[/name_m] [name_m]Richard[/name_m] [name_u]Kingsley[/name_u]
[name_u]Mason[/name_u] [name_m]Samuel[/name_m] [name_u]Kingsley[/name_u]
[name_m]Nicholas[/name_m] [name_u]Oliver[/name_u] [name_u]Kingsley[/name_u]
[name_m]Zachary[/name_m] [name_m]Samuel[/name_m] [name_u]Kingsley[/name_u]
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These are lovely names!
a sibset of 4:
[name_f]Aurelia[/name_f] [name_f]Elizabeth[/name_f] and [name_f]Heloise[/name_f] [name_f]Noelle[/name_f]
[name_m]Kasper[/name_m] [name_m]Richard[/name_m]
[name_f]Vienna[/name_f] [name_f]Pearl[/name_f]
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[name_f]Aurelia[/name_f] [name_f]Elizabeth[/name_f] and [name_f]Vienna[/name_f] [name_f]Pearl[/name_f]
[name_f]Dulcie[/name_f] [name_f]Matilda[/name_f] and [name_f]Melody[/name_f] [name_f]Scarlett[/name_f]
[name_f]Lucia[/name_f] [name_f]Rose[/name_f] and [name_f]Violet[/name_f] [name_f]Noelle[/name_f]
[name_u]Atlas[/name_u] [name_u]James[/name_u] and [name_m]Kasper[/name_m] [name_m]Richard[/name_m]
[name_m]Zachary[/name_m] [name_m]Samuel[/name_m] and [name_m]Eric[/name_m] [name_m]Thomas[/name_m]
[name_u]Atlas[/name_u] [name_u]James[/name_u] and [name_f]Vienna[/name_f] [name_f]Pearl[/name_f]
[name_m]Kasper[/name_m] [name_m]Richard[/name_m] and [name_f]Heloise[/name_f] [name_f]Noelle[/name_f]
[name_f]Aurelia[/name_f] [name_f]Elizabeth[/name_f] [name_u]Kingsley[/name_u] and [name_f]Lucia[/name_f] [name_f]Rose[/name_f] [name_u]Kingsley[/name_u]
[name_f]Vienna[/name_f] [name_f]Pearl[/name_f] [name_u]Kingsley[/name_u]
[name_m]Kasper[/name_m] [name_m]Richard[/name_m] [name_u]Kingsley[/name_u]
[name_f]Aurelia[/name_f] [name_f]Elizabeth[/name_f] & [name_f]Luciana[/name_f] [name_f]Rose[/name_f]
[name_f]Vienna[/name_f] [name_f]Pearl[/name_f]
[name_m]Nicholas[/name_m] [name_u]Oliver[/name_u]
twins: [name_f]Melody[/name_f] [name_f]Scarlett[/name_f] & [name_f]Violet[/name_f] [name_f]Noelle[/name_f]
girl: [name_f]Dulcie[/name_f] [name_f]Matilda[/name_f]
boy: [name_m]Nicholas[/name_m] [name_u]Oliver[/name_u]
bonus!: [name_m]Eric[/name_m] [name_m]Thomas[/name_m]
Reading down the lists, the order in which you listed the names, a lot of the names actually ‘go together’ well.
So like…
Girls
Aurelia and Vienna- gives me ‘worldly’ vibes
Dulcie and Violet - vintage vibes
Arlette and Luciana - Letty and Lucy is cute
I also like
Violet and Heloise- Letty and Lois.
Boy
Atlas and Eric- I like the flow, something about the short sharpness of the syllables 
Also the fact the middle names you paired with it both end in s for some reason looks/sounds appealing together to me.
Eric and Kasper- scandi vibes
Kasper and Mason-again with the syllables, but also just gives a ‘cool’ vibe to me.
Mason and Nicholas- classic vibes.
Nicholas and Zachary- classic/tradition vibes. With the added matchy nn’s Nic/k and Zac/h/k.
boy/girl
Atlas and Aurelia - those ‘worldly’ vibes again plus the alliteration
Atlas and Vienna- and again with the ‘worldly’ vibes
Violet and Kasper/Kasper and Violet- I think the -t and k-p sounds/syllables make this combo sound good together.
Mason and Lucia- Mase And Lucy/Luce
Nicholas and Lucia- Nic/k and Lucy/Luce
Zachary and Lucia- Zac/h and Lucy/Luce
Also just wanted to add K@sper K!ngsley sounds kinda cool. 
ETA- oh wow didn’t realise how long my post was until I posted it 
[name_f]Aurelia[/name_f] [name_f]Elizabeth[/name_f] & [name_f]Luciana[/name_f] [name_f]Rose[/name_f]
[name_f]Heloise[/name_f] [name_f]Noelle[/name_f]
[name_m]Nicholas[/name_m] [name_u]Oliver[/name_u]
For twin girls I love [name_f]Vienna[/name_f] [name_f]Pearl[/name_f] and [name_f]Lucia[/name_f] [name_f]Rose[/name_f]
For a brother and sister I love [name_m]Nicholas[/name_m] and [name_f]Heloise[/name_f]
[name_f]Lucia[/name_f] [name_f]Rose[/name_f] & [name_f]Melody[/name_f] [name_f]Scarlett[/name_f]
[name_f]Vienna[/name_f] [name_f]Pearl[/name_f]
[name_m]Kasper[/name_m] [name_m]Richard[/name_m]