Did anyone noticed how Ruby is willingly separating Weiss from Neptune? In the moment they went to investigate the plans of Roman & the White Fang? Where Weiss asked to go with Neptune und Ruby just laughed it off and took her with her?
The two on the bottom left?? They could be, but they could also be a straight couple, or family, or honestly, just friends. That level of intimacy as displayed above is not uncommon at all, especially in Asia.