Skibidi parasites ontogeny (1)
There is a hypothesis that humans are a paedomorphic species, like the axolotl and the telephone-pole beetle. These species reach sexual maturity in a juvenile form and never assume their 'true' adult form except under bizarre circumstances. You can force an axolotl into a salamander by giving it the right hormones, and you can force a telephone-pole beetle grub into its adult beetle morph by applying heat(!)
If humans are indeed paedomorphic, there doesn't appear to be a trigger for a human to metamorphose into our 'true' form.1 What's probably going on is that we simply look more baby-like than other apes because we've effectively domesticated ourselves. Notice how domestic species tend to look cutesier than their wild counterparts.
That said… This is a Skibidi Toilet site, and we can get a little silly with it. Skibidi parasites are presumably an artificial species, created by the Chief Scientist Skibidi using humans as a base. What if this modification activated some latent genes, resulting in Skibidi parasites morphing as they grow up? And what might that final form look like?
Although the concept has been explored in fiction, such as in Aldous Huxley's After Many a Summer, in which a character lives for 200 years and becomes a gorilla-like creature.↩