A severely destroyed planet is a popular trope in media. Here are a few examples from fiction with pictures (spoiler warning).
- A crater with a diameter 1/3rd the size of the planet itself:
Earth (Adventure Time) https://adventuretime.fandom.com/wiki/Earth?file=AT_earth2.jpg
- A crater so large that nearly half of the planet is missing:
Concord Dawn (Star Wars) https://starwars.fandom.com/wiki/Concord_Dawn?file=Concord_Dawn_system.png
- A planet so destroyed that only a sliver remains, still maintaining the crescent shape of the partial sphere:
Earth in 2091 (Marvel) https://marvelcinematicuniverse.fandom.com/wiki/2091?file=Earth.png.jpg
- A planet cracked in half with both halves offset from each other:
Gem Homeworld (Steven Universe) https://steven-universe.fandom.com/wiki/Gem_Homeworld?file=Legs_From_Here_to_Homeworld_366.png
I know that the physical behavior of objects changes dramatically with scale, one example being the anatomical differences between insects and elephants. I would imagine, at a planetary scale, that the last three examples may just collapse back into a spherical shape because of gravity.
Could these planetary bodies actualy maintain the shape we see in fictional media?