The term 'ONE WHO ARRIVES AROUND HALLOWEEN' can be summarized as a 'Scorpio', which is a 7-letter word. Scorpio is one of the twelve zodiac signs, and it is associated with the period between October 23rd and November 21st. People born under this sign are known for their passion, intensity, and strength. They are also said to be mysterious and secretive. Therefore, a Scorpio could be seen as an appropriate representation of someone who arrives around Halloween, a time of mystery and spookiness.