kindred soul

bare one's soul

To reveal one's innermost feelings and thoughts, especially concerning one's doubts, regrets, or flaws; to tell one's personal secrets to others.

cut away one's soul

To be extremely displeased.

kindred spirit

Someone with the same feelings or attitudes as oneself.

life and soul of the party

Synonym of life of the party.

rest his soul

Used parenthetically to mark the referent as being deceased

rest one's soul

To wish that a person might find peace in the afterlife.

sell one's soul

To abandon one's spiritual values or moral principles for wealth or other benefits.