Since we already know about Lucius and Amycus, let's move on with the other two.
James: he'll likely want nothing to do with you. Ever.
Severus: we must plot at some point, indeed. He would be... I suppose that 'tolerant' is a good word. Since they're both studious, they might get on well enough. Severus simply doesn't have time for people who prattle on, though.