Tattoo
Tattoos are a huge storytelling device in anime character art. You'll notice they vary from typical yakuza-inspired backpieces to smaller symbols on the character's neck or wrists that imply a hidden past. It's a visual trait that adds a gritty, high-class touch to the character's silhouette, often showing the artist's skill in rendering intricate designs and fine lines against the character's skin.
Fans enjoy the look because it's personal and edgy. The artwork often incorporates high contrast lighting and subtle bokeh effects that give the texture of the tattoo a realistic look. So, whether it's neon pink gradient shading on a magical sigil or black tribal art, it makes for a decent phone lock screen.