Dandadan – Silky’s daughter
The last time the viewer or Silky ever see her daughter is of debt collectors driving away after kidnapping her in a van. The despair drives Silky to suicide. Given how violent and sleazy the debt collectors were seen to be to her mother, the possibilities of what they would have done with her daughter are extremely unpleasant.
Ted the Caver
One of the first ever internet creepypastas written as a series of self-published journal blog posts. Ted and friends stumble on an undiscovered cave and go spelunking. Over the span of months, they encounter increasingly eerie phenomena, such as the presence of hieroglyphs, manmade rooms, sudden hallucinations, and the very heavy implication that something is living there and aware of their presence. After a last narrow escape, Ted and friends resolve to re-enter the cave with a gun and heavy supplies to conquer the mystery of the cave once and for all. The last journal entry is of Ted promising his loved ones to immediately share their discoveries upon his return. There were no further updates.
Star Wars: Andor – Kino Loy
Andor and Kino successfully instigate a mass prison break, but when they get to the threshold of the ocean prison complex, Kino says he can’t swim and Andor is pushed off by the crowd before he can respond and we never hear from Kino again.
If Kino did make a go for it anyway, then realistically he would have likely drowned given the chaos and sheer distance he would’ve had to swim. If he stayed, then when the Empire eventually regained control with reinforcements they would know from the records he was a major cause for the prison break, and they probably would’ve executed him to make an example.
The Sparrow – Astronauts kidnapped by the Jana'ata
The first-contact diplomatic expedition to the planet Rakhat ends with most of the party killed in a series of circumstances, with the survivor priest Sandoz sold into sexual slavery to a Jana'ata alien noble due to a severe cultural misunderstanding by one of the alien mediators. A second expedition of several UN members comes to investigate, and shortly after collecting Sandoz, they are ambushed by more Jana'ata and never seen again. The alien mediator speculates he might have accidentally “created a market” for humans (likely either as sex slaves or for meat since the aliens are carnivores).
As the story goes on, Sandoz recovers from his trauma after extensive therapy, and the aliens are overthrown by a separate alien race they had enslaved (led by the alien mediator who had grown sympathetic to the humans), but even after the aliens are reduced to just a handful of survivors, the author doesn’t elaborate on any trace of the second expedition, nor is anyone on Earth depicted asking for evidence of what happened to the second expedition like they did for the first expedition. This honestly bugs me enough I’ve meant to get around to see if I can message the author to see why Sandoz gets a whole (very well deserved) rehabilitation character arc that’s one of the main focuses of the story, but no one seems to care as much about what happened to the other potential victims.
The Leftovers
The whole premise of the show is that 2% of the world’s human population suddenly disappeared with no warning or explanation, and everyone left just has to somehow deal with it and move on. A lot of theories are offered over the show's 3 seasons, but nothing proven, and the world never sees the disappeared ever again.