Appropriator (noun)

A person who takes possession or control of something, especially without authority or without proper consideration for others.

Origin:

Late 16th century: from latin appropriator, from appropriare 'make one's own, take possession of'.

Examples:

1. The appropriator stole the artwork from the museum.
2. The appropriator was accused of taking the funds for personal use.
3. The appropriator was caught red-handed by the police.
4. The appropriator was sentenced to five years in prison for his crimes.
5. Many people view the appropriator as a thief who took what wasn't rightfully theirs.