Several Straw Hat Pirates did not trust Law and were against an alliance, particularly Usopp, Nami, and Chopper. Robin supported Luffy’s choice but also warned him about a possible betrayal. By contrast, Zoro approves of Law’s goal to defeat one of the Yonko, while Brook, Sanji and Franky have accepted Luffy’s decision.
Law seems to have formed a neutral relationship with Chopper who in return seems to have a certain level of respect for Law, partly because the reindeer finds Law’s Devil Fruit powers “cool”, as seen when he used them to warp around Caesar Clown’s laboratory.
Law tends to become either appalled or deadpan whenever the Straw Hats engage in their usual childish antics. Usually cool and collected, despite his best efforts to keep them focused on their mutual goals, Law has been drawn into their carefree ‘pace’ and was shocked when he realized it. However, Law still respects them as allies since he would not claim that they were his subordinates even if it means losing his Shichibukai title. Nami said that Law is almost as reckless as Luffy, doing whatever he wants and not listening to anybody.
When Doflamingo was about to attack Nami, Chopper and Brook, Law showed some signs of concern for his allies.
During his desperate struggle against Doflamingo, it was shown that Law thinks highly of the Straw Hat Pirates, stating that they are a group capable of performing miracles.
Law doesn’t refer to some of them by their names, he either uses their epithet, such as calling Luffy “Strawhat-ya” or Sanji “Blackleg-ya” or his own made up nicknames, such as calling Usopp “Nose-ya”, Franky “Robo-ya” and Brook “Bone-ya”. He does, however, refer to Zoro and Nami by their names, calling them Zoro-ya and Nami-ya, and Chopper and Robin by their surnames, calling them Tony-ya and Nico-ya.