There are so many great suggestions!
Here are my thoughts …
Question 1 and Question 2 (The Female Protagonist)
[name_f]Diana[/name_f] is my favorite followed by [name_u]Sasha[/name_u]. [name_f]Natalya[/name_f] and [name_u]Vesper[/name_u] are cool, but do fit pretty directly into existing stories (i.e. [name_f]Marvel[/name_f] and [name_u]James[/name_u] [name_m]Bond[/name_m] canon).
Some other names I really liked (Russian // American) from above (with some new Americanized ideas) were …
[name_f]Ekaterina[/name_f] // [name_f]Carly[/name_f], [name_f]Caroline[/name_f], [name_f]Catherine[/name_f], [name_f]Chloe[/name_f], [name_f]Claire[/name_f], [name_f]Katherine[/name_f], [name_f]Katrina[/name_f]
[name_f]Jelena[/name_f] // [name_f]Gillian[/name_f], [name_f]Ginger[/name_f] [name_f]Jasmine[/name_f], [name_f]Jennifer[/name_f], [name_f]Jillian[/name_f], [name_f]Jocelyn[/name_f], [name_f]Jolene[/name_f]
[name_f]Masha[/name_f] // [name_u]Mackenzie[/name_u], [name_f]Madelyn[/name_f], [name_u]Madison[/name_u], [name_u]Marian[/name_u], [name_u]Marion[/name_u]
Oleysa // [name_f]Alyssa[/name_f], [name_f]Celia[/name_f], [name_f]Claudia[/name_f], [name_f]Elizabeth[/name_f], [name_f]Elizabeth[/name_f], [name_u]Lisa[/name_u], [name_f]Lisabet[/name_f], [name_u]London[/name_u], [name_f]Lydia[/name_f], [name_f]Lyra[/name_f], [name_f]Odette[/name_f], [name_f]Olivia[/name_f]
Here are some of my suggestions (Russian // American) …
[name_f]Agata[/name_f] // [name_f]Agatha[/name_f], [name_f]Agnes[/name_f], [name_f]Maggie[/name_f], [name_f]Margaret[/name_f], [name_f]Marguerite[/name_f], [name_f]Octavia[/name_f], [name_f]Opal[/name_f]
Anfisa // [name_f]Anna[/name_f], [name_f]Annaleigh[/name_f], [name_f]Annalie[/name_f], [name_f]Annaliese[/name_f], [name_f]Elisabeth[/name_f], [name_f]Felicity[/name_f], [name_f]Fidella[/name_f], [name_f]Freya[/name_f], [name_u]Lisa[/name_u]
Avdotya // [name_f]Ava[/name_f], [name_f]Dora[/name_f], [name_f]Doris[/name_f], [name_f]Dorothea[/name_f], [name_f]Dorothy[/name_f], [name_f]Dot[/name_f], [name_f]Dottie[/name_f]
[name_f]Irina[/name_f] // [name_f]Erica[/name_f], [name_f]Irene[/name_f], [name_f]Iris[/name_f], [name_f]Katrina[/name_f], [name_f]Trinity[/name_f]
[name_f]Mariya[/name_f] // [name_f]Maren[/name_f], [name_f]Margaret[/name_f], [name_f]Maria[/name_f], [name_f]Marin[/name_f], [name_f]Martha[/name_f], [name_f]Martina[/name_f], Merit
[name_f]Marya[/name_f] // [name_f]Maren[/name_f], [name_f]Margaret[/name_f], [name_f]Maria[/name_f], [name_f]Marin[/name_f], [name_f]Martha[/name_f], [name_f]Martina[/name_f], Merit
[name_f]Oksana[/name_f] // [name_f]Anna[/name_f], [name_f]Anne[/name_f], [name_f]Hana[/name_f], [name_f]Hannah[/name_f], [name_u]Oakley[/name_u], [name_f]Olive[/name_f], [name_f]Olivia[/name_f], [name_f]Samara[/name_f], [name_f]Sarah[/name_f], [name_f]Savannah[/name_f], [name_f]Sienna[/name_f]
[name_f]Olga[/name_f] // [name_u]Gale[/name_u], [name_f]Gayle[/name_f], [name_f]Olive[/name_f], [name_f]Olivia[/name_f], [name_f]Olympia[/name_f]
[name_f]Raisa[/name_f] // [name_f]Rachel[/name_f], [name_u]Rain[/name_u], [name_f]Raina[/name_f], [name_f]Ramona[/name_f]
[name_f]Susanna[/name_f] // [name_f]Anna[/name_f], [name_f]Anne[/name_f], [name_f]Hana[/name_f], [name_f]Hannah[/name_f], [name_f]Samantha[/name_f], [name_f]Susan[/name_f], [name_f]Sybil[/name_f], [name_f]Sylvia[/name_f]
[name_f]Svetlana[/name_f] // [name_f]Anna[/name_f], [name_f]Anne[/name_f], [name_f]Hana[/name_f], [name_f]Hannah[/name_f], [name_f]Lana[/name_f], [name_f]Lara[/name_f], [name_f]Sally[/name_f], [name_f]Samantha[/name_f], [name_f]Sybil[/name_f], [name_f]Sylvia[/name_f]
[name_f]Tamara[/name_f] // [name_f]Mara[/name_f], [name_f]Marnie[/name_f], [name_f]Matilda[/name_f], [name_u]Talley[/name_u], [name_f]Tamsin[/name_f], [name_f]Tasmine[/name_f],
[name_m]Vaska[/name_m] // [name_f]Valerie[/name_f], [name_f]Vanessa[/name_f]
Zhenya // [name_f]Susan[/name_f], [name_u]Yael[/name_u], [name_f]Zahra[/name_f], [name_f]Zara[/name_f]
[name_f]Zinaida[/name_f] // [name_f]Adelaide[/name_f], [name_f]Aida[/name_f], [name_f]Alaina[/name_f], [name_f]Ava[/name_f], [name_f]Nadia[/name_f], [name_f]Nadine[/name_f], [name_f]Zahra[/name_f], [name_f]Zara[/name_f]
Question 3 and Question 4 (The Male Antagonist)
[name_m]Dante[/name_m] is my favorite of your picks. I also like how your other choices can be easily Americanized, though I think these names are too familiar to seem menacing.
From the suggestions I like [name_m]Emilio[/name_m] and [name_m]Marco[/name_m], though these are pretty similar to your already listed options.
Here are my suggested first and last name suggestions. Select and mix and match whatever works for you!
[name_m]Abramo[/name_m] …Silvestri
[name_m]Angelo[/name_m] … Piraino
[name_m]Arturo[/name_m] … Notoriano
[name_m]Bello[/name_m] … Salvaggi
[name_m]Bravo[/name_m] … Voltolini
[name_m]Ceasario[/name_m] … Barsotti
[name_m]Damone[/name_m] … [name_m]Gabrielli[/name_m]
[name_m]Duran[/name_m] … Aquino
[name_m]Faro[/name_m] … [name_m]Durante[/name_m]
[name_m]Gerome[/name_m] … Calabresse
[name_m]Gian[/name_m] … Acardi
[name_m]Ilario[/name_m] … Nascinmebi
[name_m]Orlando[/name_m] … Carnevale
[name_m]Orsino[/name_m] … de Laurentis
[name_m]Silvio[/name_m] … Rotolo
[name_m]Tasso[/name_m] … Gagliardi
[name_m]Vesuvio[/name_m] … [name_u]Tivoli[/name_u]
[name_m]Vittorio[/name_m] … Taverna
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Good luck writing!