Avenger in Chinese / Japanese...

復讐者 is a Japanese Kanji title that means avenger or revenger.

The first two characters literally mean revenge or avenge.

The last character is a way to say a person (or soldier/warrior).

Altogether, you have something like, an “avenging person,” hence avenger.

復仇者 is a Chinese title that means avenger or taker of revenge.

The first two characters literally mean avenge, vengeance, reprisal, or revenge.

The last character is a way to say, person. This last character is like adding -er or -ist to subjects like write and art to get writer and artist.