Re-reading LOEG: Black Dossier and noticing similarities to...

both Unwritten and Sandman. So much intertextuality going on between those three works and, well, pretty much all of the English canon.
I'm specifically speaking of the part of Black Dossier that chronicles the long, strange history of Orlando.
Orlando is an immortal, and a transitional hermaphrodite - s/he changes genders at random intervals, with no control over when these changes occur. Orlando is described as androgynous. This reminds me quite a bit of Desire of the Endless. Immortal, androgynous, and rather self-involved. Orlando spends most of recorded history fighting in wars s/he has no stake in - picking sides at random, fighting mercilessly, switching alliances without real reason.
Beyond the Desire/Orlando comparison, there are other similarities to Sandman. The fictionalization of real historical events, and the insertion of a fictional character into those events in an important, game-changing sort of role. This same thing happens in Unwritten.
In Orlando's tale, the titular character is interjected into many of the major battles of history, as well as some fictional ones. S/he is an operative of Queen Titania's first "league" (presumably the origins of the modern day LOEG), the same Queen Titania of Shakespearean lore, also seen in Gaiman's re-telling of "A Midsummer Night's Dream". Orlando also claims to be the "Roland" on which "The Song of Roland" is based (Roland, presumably, being a bastardization of "Orlando") - the lone survivor of the battle of Roncesvalles - a plausible claims considering what we know of Orlando's immortality and history as a soldier of fortune.
This same Roland is important in Unwritten, as well. Tommy Taylor first realizes that he can bridge the gap between the fictional and real worlds by (unintentionally) summoning Roland into existence. Unwritten also inserts the "Cabal" into historical events spanning all of known human history.
The Cabal is interested in controlling outcomes by manipulating stories, Orlando simply wants to earn a quick buck and stave off the boredom that inevitably comes with immortality, and the Endless are just doing what they are meant to do, and humans are more set-dressing (or maybe pawns) than anything. In every one of these cases, though, immortal beings manipulate the real and fictional universes with varying degrees of success and for significantly different reasons.