Just because I'm bored, I came up with a few alternate names for some of the Legionnaires. I tried to follow the old school rule of having boy, girl, etc. in the name, and I leaned towards alliteration.
I think I have a couple of pretty good ones for Shadow Lass, but most of the rest of these are just silly and for fun.
Shadow LassMidnight Maiden (or Maiden Midnight)
Darkness Damsel
Stygian Squaw
Light LassWeightless Wench
Saturn GirlMental Maiden
Telepath Tomato (or Telepath Tootsie)
Chameleon BoyProtean Punk (Protean Person)
Mercurial Man (Mutable Man)
Phantom GirlIntangible Ingénue
Dream Girl[/U]
Dream Damsel
Sexy Soothsayer
[U]White WitchSnowy Sorceress
Milky Mage
Element LadTransmutation Teen
Sun BoyFlamer
Fire Fellow
Hot He
Colossal BoyBrobdignagian Boy
I'm sure someone else can do better, though. Have at it.