Remus
Remus had stayed in the back, on the fringes of the assembled, for the service. Several members of the Weasley clan might consider him family, but he wasn't family today. This wasn't his place to be. And so, he'd stayed on the edges, silently watching the proceedings surrounded by only his own regrets.
Then he waited until most had moved away from the open graves themselves before moving forward to pay his own final respects.
Angelina he had barely known. His future self had taught her in the same way he now taught her children. But, as he was now, he had only known her as Alex's mother, who he saw in passing at gatherings. That was how he would mourn her, through empathy for her son and daughter, whose sense of loss he knew keenly from his own experience and who he would be watching out for more closely now at the school.
Arthur. The older man had been a friend, of a sort, though truly only through Remus' later self. He had taken Remus' son into that tight-knit family and for that Remus would always be grateful. The man had lived a good life, raised a good family, and would be remembered as a friend that should have been.
And then, Gideon. Gideon was the hardest to swallow. Gideon was his time, someone Remus had sort of looked up to in school. They'd done this once. Gideon and Fabian, both gone together the way the brothers would have wanted. And yet, Gideon had been given a second chance, the same as Remus. A second chance that was now over. More than anything, losing Gideon again brought back the realities of the first war and forced him to look at the potential realities of this one, the potential for loss.
Looking around at those still gathered when he was finished with his good-byes, it was difficult not to see them each and wonder who would be next, where it would end, and if any of them would be there to see it when it did.