There are now so many chapters for this interactive that it's pretty difficult to describe what all each one entails. Here is my attempt to describe what you might expect to find by following the major branches, so you can better pick what suits your fancy.
Skinny starts
Alice (Letting themselves go): fit-to-fat, mutual gain, XWG, female feeder, willing prey, endo, supernatural
Gwen/Maria/ (Abbie et al) (Gaining on purpose): eating contest, normalization of vore, food chain of larger predators
Jamie/Carmen/Student Cannibal Committee (Eating other skinnies): XWG, mass vore, giantess, male & female feeders, sci-fi
Marissa/Dr. Opal Gass (Eating fatter people): giantess, sci-fi, Wonka parody, normalization of vore and feedism... hip hop?
Chubby/Fat starts
Ming (fat kids, a bus driver): child prey, XWG, giantess, sci-fi
Kyreen DeLato (fat kids, A teacher): … vore at a school, I suppose.
Phoebe (fat kids, A stay-at-home Mom): mother/daughter fatness
Rachael (greedy roommate): XWG, mass vore, mutual gain, office gain
Add Belching
Nefertiti and Infelicity: pretty self-explanatory, they both attend an academy for gassy girls.
GIGANTIC
Cassandra (Circus freak): giantess, normalization of vore, endo, romance,
Kelly (Ate until you were a giant): giantess, endo, animal prey, demi-human animal TF
Multiple Main Characters
Mary and Pico (A couple - male and female): mutual gain, fat admiration
To get the story started, pick a weight the main character will start at, or another option.