Skeleton
Skeletons in anime are more than Halloween decorations. They usually appear as tenacious undead kings or sad warriors. Ainz Ooal Gown makes giant skeletons look royal and scary in Overlord. There are also characters like Brook from One Piece who show that bones can have soul and humor. The unique style and dark fantasy make these designs popular as backgrounds.
Here, artists love body manipulation. Fan art shows magical bones or worn-in armor. Scary, gritty, with shadows and broken skulls. With the ribs and vertebrae's clean lines against a dark background, it can be elegant. It is popular with wearers who want edge without gore. That spooky, stylish memento mori vibe.
There is everything from a powerful lich on a throne to a skull in a flower field. Symbols of immortality and heroism often include skeletons. Because of its versatility, this trope never goes out of style. A character can be shown full-body or as a skull with glowing eyes. Dark fantasy wallpapers like these are hard to beat if you like anime's supernatural side.