What is the word for someone who is always helping others?

Someone who is always helping others can be known as a Good Samaritan.

Words that describe someone who is always helping others are:

generous - (adj.) liberal in giving or sharing

self-sacrificing - (adj.) will to deprive yourself for the benefit of others

affectionate - (adj.) having or showing fondness

altruistic - (adj.) unselfish

amiable - (adj.) friendly, agreeable

benevolent - (adj.) charitable, kind

humanitarian - (adj.) giving, compassionate