When I get around to it;
Antoninius - bolter marine, I'll try to get him in the standard hipfire, rockstar stance pose from classic Marine artwork - he's a marksman bolter specialist.
Julius - Sergeant, will have bolter in one hand, and the other I'll try to fabricate something - I'm thinking I'd like a Marine-scale auspex. I've got a good base, so I'll try for a more interesting pose, rather than the A-line that Novarius (my plasma marine under discussion) and Antoninius (my other metal marine for this squad) will have.
Scarus - bolter marine, but more around combat and grenades, so either a knife in his off-hand, or a grenade. I've forgotten which base I picked for him, so not sure on pose yet - I may try to imitate Gav's Alpha Legionnaire to an extent here though?
Cassius - bolter marine, but also the squad medic (sort of). I'm half-tempted to have him kneeling, to see how it looks for a marine to do that at this scale. No idea yet though.
After that, all the other marines will be from other chapters so they'll probably get a different thread as they won't be part of this squad.
I've actually got enough marines that - outside of this squad - I'm not sure how many I've actually got now! I'm hoping I've got at least 3 more though (not counting one I've purposely set aside for a second Cypher model to imitate the new version), as I'd ideally like an Imperial Fist, Crimson Fist, and one other - I'm hemming and hawing between a Blood Raven, Raven Guard, Salamander, or Lamenter, and honestly if I had enough marines to do one each of those as well as the ones I've already done, then that would be brilliant. On the other hand, I only have so much space to store all this stuff, and I really need to clamp down on this sort of thing, otherwise I'll end up with a 4th maplin case of Inquisitor models.