The characters who elude the moral antithesis of heroism and villainy generally are or suggest
spirits of nature. They represent partly the moral neutrality of the intermediate world of nature and partly a world of
mystery which is glimpsed but never seen, and which retreats when approached. Among female characters of this type are the shy nymphs of Classical legends and the elusive half-wild
creatures who might be called daughter-figures, and include Spencer's Florimell, Hawthorne's Pearl, Wagner's Kundry, and Hudson's Rima. Their male counterparts have a little more variety. Kipling's Mowgli is the best known of the wild boys; a green man lurked in the forests of medieval England, appearing as Robin Hood and as the knight of Gawain's adventure; the "salvage man", represented in Spenser by Satyrane, is a Renaissance favorite, and the awkward but faithful giant with unkempt hair has shambled amiably through romance for centuries.
Such characters are, more or less, children of nature, who can be brought to serve the hero, like Crusoe's Friday, but retain the inscrutability of their origin. As servants or friends of the hero, they impart the mysterious rapport with nature that so often marks the central figure of romance. The paradox that many of these children of nature are "supernatural" beings is not as distressing in romance as in logic. The helpful fairy, the grateful dead man, the wonderful servant who has just the abilities the hero needs in a crisis, are all folk tale commonplaces.