Slightly

Origin
Slightly is one of the six Lost Boys in the original Peter Pan story. In the novel, Peter and Wendy, he is described as the most conceited of the boys, because he believes that he, unlike the others, remembers what life was like before he was "lost". However, most of his "memories" are either based on misunderstandings or pure fabrications: one example is that he claims to know what his last name is: his pinafore had the words "Slightly Soiled" written on the tag.

Slightly has a secret which inadvertently gives Captain Hook the opportunity to poison Peter. Each of the Lost Boys has his own tunnel entrance to the Underground House which is precisely the right size for each boy; if not, Peter would (somehow) adjust the boy's size accordingly. But Slightly is overly fond of drinking water, and has swelled up a bit from it; rather than being slimmed down again, he has increased the diameter of his tunnel... large enough for Hook to slither through. Fortunately, Slightly's door at the bottom is latched, and Hook can only reach far enough inside to poison Peter's medicine.

Slightly is apparently a poor make-believer, but he does seem to have a talent for music; he is described as cutting whistles and flutes from the branches of trees and dancing to tunes he creates himself.