I hate to sound like I’m underplaying these relationships, but they aren’t of the same scale as the previous ones. Luke Callindor does have a close connection with Timoran Wrath, Delvin Cunningham, and Dariana. They are close friends and have been through a lot together. One could even consider them siblings born from battle. His current situation is rough on all of them, but there’s simpler answers here.
Given that he is usually very calm and controls his rage, Timoran finds focus from what is going on. In this way, he is similar to Fizzle and also has faith in Luke surviving. The difference is that Timoran thinks this only because he has seen his friend come out alive time and again. He doesn’t say it, but he knows that there is always a chance that Luke will die. This stems from him having lost many allies in battle, which is practically a rite of passage for barbarians. One can see Timoran being the champion fighting to keep everyone calm and united. That isn’t to say he’ll always retain his control. While he taught Luke how to be wiser, he has adopted a little bit of impulsiveness from his friend.
Delvin and Luke have always had a brother-in-arms thing. Being the more experienced warrior, Delvin has occasionally taken on the role of mentor and older sibling. He has always been happy to share what he’s learned with Luke and helped him get over some of the common trials of being a warrior. Coming from the same teacher, they bonded fairly quickly too. The wild forest tracker with the calm Mercenary Prince makes for an interesting friendships. Still, Delvin may feel a little lost and irritable now. His nature is to protect his friends and he feels like he failed. He does know that there was nothing he could have done, but he has assumed a leadership role at times. Again, you might see him acting calm in most situations like Fizzle and Timoran, but he will be frayed around the edges.
This is the tough one because it should be bigger. Yet, a lot of revelations came out in The Spirit Well that I shouldn’t say here. All I will mention is that Dariana has been a bigger factor in Luke’s path than he realized. Because of her social awkwardness and some secret reasons, she has never had the closest relationships. Not how we would see it, but they are cherished by Dariana. She ends up taking the brunt of the guilt and anger in regards to Luke’s capture due to what happened in the last book. Because of this, she is suffering and not at full strength during this adventure. There might also be a residual psychic connection that that Baron has using to keep her unbalanced by sending her vivid images of what he is doing to Luke.