Not really Space Butler, i'm sorry that you see it that way but you can put them close if you want to see that there's very little in common.

Although i'd like to point out that there are some details that resembles some shapes used in other warframes design. That's only common practice though, many Warframes have something in common between each others (Nyx it's basically a female Excalibur in that sense) and it's used to make them look like they belong to the same world. I hope it's more clear.

Nyx actually was a female Excalibur originally. At an early point in development, DE was going to make male and female versions of all the warframes. When they scrapped that idea, the female Excalibur model was re-used for Nyx.

Oh see i din't know. I hope they'll give us the greenlight on Nyx, if i'm still making skins when that happen she'll get the priority right away ^^.

I learned something today. lol