I like [name_m]Claudius[/name_m]. I think it’s fine that he’s not an antagonist, since it has already been done. You could subvert the antagonistic connotation by making him extremely kind and loyal, or something.
[name_u]Gray[/name_u] is nice for a girl, but I’m not sure if it goes well with [name_m]Claudius[/name_m]. Like the previous poster said, the two styles are very different.
I would suggest [name_f]Zelda[/name_f], which means “gray fighting maid” and has an older feel like [name_m]Claudius[/name_m].
[name_f]Griselda[/name_f] could work too. Gris is [name_m]French[/name_m] for gray, and the name means, “gray battle”. Plus, the name has strong literary ties, like [name_m]Claudius[/name_m]. [name_f]Griselle[/name_f] can be a more feminine take on the name.
Names similar to [name_u]Gray[/name_u] in sound ([name_u]Gray[/name_u] could be a nickname): I put a star next to my favourites
[name_f]Grace[/name_f] (I also saw the spelling [name_f]Grayce[/name_f])
[name_f]Greta[/name_f]
[name_f]Gradie[/name_f] / [name_u]Grady[/name_u]
[name_f]Greer[/name_f]
[name_f]Allegra[/name_f]*
[name_f]Desiree[/name_f]
[name_f]Raina[/name_f] / [name_f]Rayna[/name_f]
[name_u]Reagan[/name_u]
[name_f]Rachel[/name_f]
[name_u]Ray[/name_u] / [name_u]Rey[/name_u]
[name_f]Ayla[/name_f]
[name_f]Adrienne[/name_f]
For the brother, [name_u]Jules[/name_u] or [name_m]Julian[/name_m] came to mind first. I’m avoiding [name_m]Julius[/name_m] because it is extremely similar to [name_m]Claudius[/name_m], though I do like the name.
Like [name_u]Gray[/name_u], [name_u]Jude[/name_u] could be a nickname. [name_m]Judas[/name_m] would have the same treacherous connotation and classic feel as [name_m]Claudius[/name_m].
Other soft-sounding boy names:
[name_m]Jasper[/name_m]
[name_m]Jason[/name_m] / [name_m]Jase[/name_m]
[name_u]James[/name_u] / [name_u]Jameson[/name_u] / [name_u]Jamie[/name_u]
[name_m]Jaron[/name_m]*
[name_m]Judd[/name_m]
[name_m]Justus[/name_m] / [name_u]Justice[/name_u]
[name_u]Jermaine[/name_u] / [name_u]Germaine[/name_u]
[name_m]Jerome[/name_m]
[name_m]Gerald[/name_m]* / [name_m]Gerard[/name_m]
[name_m]George[/name_m]
[name_u]Gene[/name_u]
[name_m]Elijah[/name_m]
[name_m]Benjamin[/name_m]
[name_u]Bryce[/name_u] / [name_m]Bruce[/name_m]
[name_m]Cesar[/name_m] / [name_m]Caesar[/name_m]
[name_u]Lawrence[/name_u]*
[name_m]Cyril[/name_m] / [name_m]Cyrus[/name_m]*
[name_f]Sib[/name_f]-sets I like:
[name_m]Claudius[/name_m], [name_f]Grace[/name_f], and [name_u]Jules[/name_u]
[name_m]Claudius[/name_m], [name_f]Allegra[/name_f], and [name_m]Julian[/name_m]
[name_m]Claudius[/name_m], [name_f]Griselda[/name_f], and [name_m]Judas[/name_m]
I hope this is helpful! Good luck 