Halloween (1978)
Michael Myers from Halloween, certainly one of the creepier monster characters. The small candle inside the pumpkin is electrified and can be illuminated for great effect.
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From Wikipedia:
Halloween is a 1978 American independent horror film directed, produced, and scored by John Carpenter, co-written with Debra Hill, and starring Donald Pleasence and Jamie Lee Curtis in her film debut. The film is set in the fictional midwestern town of Haddonfield, Illinois. On Halloween, six year old Michael Myers murders his older sister. Fifteen years later, he escapes from a psychiatric hospital, returns home, and stalks teenager Laurie Strode and her friends. Michael’s psychiatrist Dr. Sam Loomis suspects Michael’s intentions, and follows him to Haddonfield to try to prevent this from happening.