Plotlines that went nowhere

My one frustration with the show during my original watch (not do much on my rewatch because I was ready for it lol) was plotlines that just went nowhere.

For instance, as another poster pointed out, Mulan's plotline went nowhere and just fizzled out. Which was a huge shame because she was a great character played by a kick ass actress.

Another was Will Scarlett. Him showing up was SO confusing back in the day to those of us who had watched OUATIWL because his storyline had resolved with his happy ending, especially with him dating Belle.

Another was Ruby disappearing for awhile from the show. I know the actress got other roles for other shows but man, she was such a great character! I wish they would have made it so she would have been in a position to refuse those other roles and been around more. I guess that one isn't really a plotline issue though.

What plotlines that went nowhere bothered you?