This chapter is for WandsAndMockingjays ( I absolutely love your user name by the way). Athough not the easiest to write, here you go…
Other than Ron, Bill was the only other Weasley to encounter the Mirror of Erised. I'm sure there are guesses that could be made for the other 5, but for Bill( or at least 14 uear old Bill) we knew for sure.
Young Bill walked up to the mirror and saw something almost lacking excitement btu to him it was all he saw. He wanted to be Head Of International Affairs and the Ministry of Magic. All his childhood it was his dream job. Aside from his schooling, his Hogwarts days were filled studying foreign languages and cultures. The first war started to take more of an impact on him, however, and he never even tried for a Ministry position, knowing the danger and never believing the war was over, he settled for Gringots , and let go of his dream.
After that, Bill never saw that mirror again. But as an adult he knew it would have shown him "whole" in his opinion anyway. He would have been himself before Fenrir with a smiling Fleur looking on approvingly. Despite any and all of her protests, he never believed himself worthy of that lovely French belle.