YOU SAID:

I’m a dark and horrible person.

INTO JAPANESE

私は暗いと恐ろしい人です。

BACK INTO ENGLISH

And I think dark is a horrible person.

INTO JAPANESE

暗いと思う恐ろしい人です。

BACK INTO ENGLISH

It is a dark and frightening people.

INTO JAPANESE

暗くて恐ろしい人です。

BACK INTO ENGLISH

It is a dark and frightening people.