Boy Blue is a human character based on the nursery rhyme:
Little Boy Blue, come blow your horn, / The sheep's in the meadow, the cow's in the corn; / Where is that boy who looks after the sheep? / Under the haystack fast asleep.
As in the nursery rhyme, Boy Blue looks after the farm animals but sometimes falls asleep on the job. Like many characters, his appearance can vary greatly from comic to comic.
- My Little Pony comic #2 - The ponies wake up Boy Blue and help him find his horn. 
- My Little Pony comic #163 - Boy Blue is one of the guests at the harvest feast the ponies are putting on.
- "Little Boy Lost." My Little Pony #2, London Editions Ltd. 1985.
- "Player and the Horn of Plenty" My Little Pony #163, London Editions Ltd. 1991.