Pearl (Steven Universe).

Planet K2YX-4 is designated restricted by Homeworld Authority due to the presence of "Gem Eaters", beasts who consume a Gem and absorb their energy using tentacles that penetrate deep into a gem's physical form. A gem can remain trapped in this state for centuries until their gem loses all energy. Even if a gem is recovered from a Gem Eater, they are designated "shattered" due to the psychological strain it leaves on them. A few rescued gems even secretly returned to the planet to be willingly re-consumed.

Unfortunately for Pearl, the restricted designation came after the Crystal Gem's rebellion and they were not informed of the danger it posed.