unless I am missing something several characters despite having variable are missing/incomplete quest lines. Not to mention a lot of the branch choices are basically dead ends without anything added. Here are the ones I noticed that are missing.
1) Ronald should you choose to let him slide and not help Ms. Taylor (branch path that Leads to a dead end)
2) Sarah should you not give her the third Tinymon card (a branch path that not only leads to a dead end but causes a lot of the content is forever blocked)
3) Ms. Gina and the gym teacher (both have variables but no quests)
4) Roslevta (has a branch path that isn't the dark but can't be accessed)
5) Marge (Has an incomplete quest line)
6) Sharon (has possibly two branch paths that are incomplete (unless the path for not ratting on her and being able to fuck her whenever you want is basically the end of this path)