You Say Malachim, I Say Apsaras
Angels, by any name, exist in many world religions.
Devas are spiritual beings by nature--their form is usually described as bodies or emanations of light or energy. They are, however, often depicted in physical form, and there are many images of devas or dharmapalas, particularly in Tibetan Buddhist iconography.
Devas normally do not interfere in human affairs, but as Buddhist teacher Lama Surya Das notes, they have been known to rejoice, applaud, and rain down flowers for good deeds performed in the world. In Thailand, it is believed that devas approve of people meditating and will harass people of whose behavior they don't approve.
The bodhisattva of compassion, known as Kwan Yin in Chinese and Chenrezig in Tibetan, is widely viewed as a sort of Buddhist angel. The bodhisattva's original Sanskrit name, Avolokiteshvara, means "hearer of the 10,000 cries"--that is, he or she (the bodhisattva is male in the original Buddhist texts, but is represented as female in many Buddhist schools) perceives the suffering of all sentient beings. In some sects, reciting her name is believed to summon her aid.
Angels in Catholicism are intermediaries between God and humans. In addition to their role as servants and messengers, angels are also attendants to God's throne. Catholic theology outlines a hierarchy of nine choirs of angels divided into three groups: Seraphim, Cherubim and Thrones; Dominations, Virtues and Powers; Principalities, Archangels and Angels.
The Catechism of the Catholic Church declares: "The existence of the spiritual, non-corporeal beings that Sacred Scripture usually calls 'ANGELS' is a truth of faith." Angels have a huge role in Christian history--announcing Christ's birth, protecting Christ in the wilderness, battling Satan in the Book of Revelation, and more.
Angels are pure spirits and don't have corporeal forms. They remain disembodied forever. Traditional Catholicism teaches that angels speak "within" a person, and not "to" them, thereby maintaining their spiritual nature.
Catholics believe that each individual also has his or her own guardian angel. Guardian angels can intervene in human affairs to help people. They can also influence people's senses and imaginations, but not their will. They remain with their charges even in heaven. The Catechism states: "From infancy to death human life is surrounded by their watchful care and intercession." Catholics pray to angels to ask for their help and intercession in human affairs.
Gabriel, Raphael, and Michael are the chief angels, called archangels. Gabriel announced to Mary that she would give birth to the son of God. Michael's role includes fighting evil and Satan and rescuing the souls of the faithful at the hour of death. He will be present at the time of the Antichrist and the end of the world. Raphael appears only in the Apocrypha, as the angel who helped Tobiah cure his father's blindness in the book of Tobit. The unnamed Angel of the Lord in the Old Testament is said by some to be the pre-incarnate Christ. Lucifer is the fallen archangel who, with one-third of the angelic host, was cast out of heaven for the sin of pride. He presides over hell and seeks to lure mankind to sin.