Yamato, Law, and Vivi are the last three Straw Hats and Vivi will gain the Nikyu Nikyu no Mi
11 (inu) plus 08 (Ope) plus 29 (Nikyu) = 48 plus 325 (which is for all the Straw Hats pre-TS with devil fruits) = 373
3 + 7 + 3 = 13, which is the amount of Mugiwara we have with these three
Yamato will be the quartermaster
Law will be a number of things, probably most likely a surgeon or lookout
Vivi will be a diplomat