In Dragon Ball Z, Trunks and Goten grew up not having Saiyan tails, the real reason revealed by Toriyama, the author of the series. Goten and Trunks have mixed blood. Their fathers are full-blooded Saiyans and their mothers are full-blooded humans. As a result, they are half-Saiyan and half-human.
These are all of the conceivable explanations for Trunks and Goten’S missing limbs. Their forefathers bestowed various advantages upon them, including supernatural power and the ability to change into Super Saiyans. However, one Saiyan trait seems to outrun these 2: those monkey-like tails.
When asked why Goten and Trunks don’t have tails, Akira Toriyama explained that tails are a recessive characteristic. This means that when it comes to hybrid Saiyans, the chances of their having a tail are little to none.
As reported by the CBR news, despite being half-Saiyan, both Goten or Trunks have ever exhibited symptoms of acquiring a Saiyan tail. Bulla, for that case, hasn’t. This is odd because Goku’s second son, Gohan, is also a Saiyan mix and had a tail. Several theories have been proposed by fans or even through God’s word to explain this apparent abnormality.
The Big Reveal
The initial theory is that Goten and Trunks’ tails were severed. The first is that it would help them blend in more as Earthlings. It could also have been done so that they wouldn’t turn into Great Apes when they saw a full moon.
Dragon Ball was supposed to be about a real monkey, not just a humanoid with a tail, at first. The tail was one design that was preserved with Goku.
Akira Toriyama, the creator of Dragon Ball, on the other hand, grew tired of designing tails for Goku, Gohan, Vegeta, Raditz, and Nappa after years of doing so. All of the Saiyans’ tails were lost not long after Z.
Toriyama couldn’t be bothered to draw tails any longer when it came to Trunks and Goten, and that was the end of it. The canon explanation is that the tails, like hair, may have come from either parent, but the real reason is that Toriyama found them bothersome, as cited by the Dragon Ball Guru page.