Benefactor
noun
A kindness person is a very kind person. This person is a benefactor.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
コウイチは私の恩人です。私がベーコンに溺れていた時、私を救ってくれたんです。
Koichi is my benefactor. He rescued me when I got addicted to bacon.