Not to be populist, but I have to sincerely agree with some of the previous anons, for me Adeline will always and forever be the absolute pinnacle of human female perfection in every way, especially when considering the mind blowing sheer amount of weight the girl gained across her illustrious career, and then on top of that, she was the sweetest person anyone could ever hope to encounter. I was lucky enough to know her personally and I miss her deeply.
Number two would definitely have to be Vanilla Hippo for me, she was beautiful and big as hell in every way imaginable and also seems like a really cool person to hang out with. I thought that she got way too much flack for finally going under the knife and getting help, but the girl was just far beyond anything approaching sustainable. I'm glad she got the help she needed and is there for her family, I will always treasure the content she made.
Number three is difficult, but I'd have to go with Juicy Jackie, she's hot af and has had an incredible gain across her career. Obviously the quality and quantity of her content has massively dropped off over the years, but at the end of the day the girl has piled on an incredible amount of weight over her career and I can't ignore the fact that every time she did a weigh in set and I thought she was as big as she was going to get, she managed to clock in heavier still.
Number 4 would probably have to be FatMissT, the size she was able to obtain at her age and her somewhat unusual build is most definitely note worthy and she is a really cute girl. I know her weight has greatly fluctuated over the years, but she has been consistently enormous. She may not necessarily have the greatest gain over her career, but reaching such extreme weights in general is pretty damn crazy.
Last but not least, for number 5 fot me is probably gonna have to be Sasha, she has been a favorite of mine in general for many years, her content is pretty consistently high quality and her gain has been nothing to sneeze at having nearly doubled her weight since being on the scene. It doesn't hurt that she also seems like a really cool chick to hangout with and she does some really hot fat talk.
Runner ups would be Pleasantly Plump, seems like a super nice girl and had a great gain & super sexy build, really hope she is able to recover from her medical issues. Trysta, mostly because she was just generally hot as hell and had an unbelievable body as well. Hayley, mostly because of sheer size and maximum cuteness. Randalin, just because of her unique & super sexy build and she did manage to really pack on some serious weight over her career, much more than I thought she ever would. Finally, Boberry, again sheer size and maximum hotness, but she's also such a more 'mainstream, populist' choice, but when all is said and done, she is incredibly beautiful, sexy and brain breakingly fat af lol.
Anyway, just my humble opinion, but figured I'd share it because oddly this is a thing I think about fairly often too and it still tends to fluctuate, but the top two will very likely always be Adeline and Vanilla Hippo, they are both just the absolute fucking best and while Hippo has sheer size over most everyone else, Adeline's gain of 400+ pounds over her modeling career is almost unprecedented and as someone else said, it doesn't hurt that she was also a smoking hot goth chick too as well as a generally amazing human being. I miss her so fucking much...