noun
background character; nameless minor character
Used in manga, anime, and light novels for characters who appear only briefly or have no real role. Often implies the character is unimportant or disposable.
あのアニメの雑魚キャラはすぐに倒されてしまう。
The background characters in that anime get defeated right away.
彼はいつも雑魚キャラ役ばかり演じている。
He always plays only minor, nameless roles.
noun
mob; weak enemy; minor enemy
Video game term for non-player enemies that are easy to defeat and appear in groups. Also used figuratively for any weak opponent.
このゲームの雑魚キャラは経験値が少ない。
The mobs in this game give little experience.
ボスより先に雑魚キャラを片付けよう。
Let's take out the minor enemies before the boss.
Compound of 雑魚 (zako, 'small fry, weakling') and キャラ (kyara, abbreviation of キャラクター 'character'). The term originated in otaku and gaming culture and spread to general slang.