Gohan. Gohan's first Saiyan tail After blowing up the moon to stop Gohan's rampage as a Great Ape, Piccolo yanked Gohan's tail off. In the anime only, the tail grew back, but was once again removed by Piccolo.
Gohan is simply a very rare case. Toriyama later said in a 2016 interview that he stopped drawing Saiyans' tails during Dragon Ball's serialization because it became confusing for him as to how Saiyans dressed themselves with the tail on. It annoyed him, so he decided to get rid of it.
Gohan is a half saiyan and had a tail but Trunks, Goten, and Bulla had no tails but were also half saiyan. Other then this I dont know why Trunks wasnt born with a tail: Akira Toriyama said that tails are a resessive trait in half saiyans. So basically Gohan just got a resessive trait.
In Gohan's case, he inherited a tail and the ability to turn into a Giant Ape under a full moon. Since Gohan is only a half Saiyan, Pan had a much less chance of having a tail because she is only a quarter Saiyan. In Bulla's case, she simply did not inherit a tail from Vegeta.
Gokus tail was cut off when he was still very young. It was cut it off By Kami to prevent him from transforming into an uncontrollable rampaging giant ape whenever the moon is out and full. They also destroyed the moon in case it wasn't enough.
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Before her death, Davina forgives Marcel because he saved her and accepts her fate, because she thinks that it would be selfish to take everyone else with her. Her throat is later slitten by Sophie to complete the Harvest, but she does not come back. She is left to be mourned by who watched it.