YOU SAID:

I exist only to kill other things

INTO JAPANESE

私は他のものを殺すためにのみ存在します。

BACK INTO ENGLISH

I will kill others for that.

INTO JAPANESE

私は他の人を殺すために。

BACK INTO ENGLISH

To kill other people.

INTO JAPANESE

他の人を殺す。

BACK INTO ENGLISH

Kill the other person.

INTO JAPANESE

他の人を殺します。

BACK INTO ENGLISH

Kill the other person.