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Lylithe
Alright here are my first ideas.
#1: Oh how lovely~ since his mate is named Lorelei, (which is a Gaelic name that means "temptress" and refers to a beautiful maiden by the shore of the Rhine River who lures men to their deaths), I was thinking you could take some inspiration from that and name him something like
Siren or even
Rhine. And is Siren is a bit too feminine for him, you could also take one of the root words of Lorelei,
Luren, a German word meaning "to watch"
#2: oh, how beautiful! A XXX Copper! Let's see, it would be awfully fitting to use something related to copper.
Aerugo is a type of metallic rust which has a similar color. Then there's
Copriferous which is the word for things which are made of copper.
Cauldron is a less outlandish option, since in old days they were commonly made out of copper. And lastly,
Cuprum which is the Latin word for copper.
#3: oh, what a nice Nocturne! Right off the bat, a name that comes to mind is
Phantom. Another cool idea is
Skul which is a really cool video game about a cute little skeleton, also the spelling is very unique. Since she's a beautiful female, you could use something a little more dark and elegant, like
Duskelle, Mystique or
Circe