Aragorn

Aragorn, also known as Elessar, Strider, Estel, Thorongil, Envinyatar and a host of other names in the various tongues of the northwest of Middle-Earth, is a character in JRR Tolkien's Lord of the Rings trilogy.

Lineage
Aragorn is of the line of Elendil, being descended both from the latter's elder son Isildur (via a many times great grandfather, Arvedui) and also from Elendil's younger son, Anarion (via his same amount of times great grandmother, Firiel). Aragorn is also a descendant of Elros, the mortal brother of Elrond. His marriage to Arwen in The Return of the King is thus vaguely incestuous, more so because he was raised as her foster-brother. Aragorn has a son, Eldarion, and an unspecified number of daughters.

Aragorn in book canon
Aragorn exudes a grim and weather-beaten air. He is introduced as the Ranger Strider, though his royal lineage and true name(s) are revealed later. A friend of Gandalf's, at the Wizard's instruction he awaits the hobbits in Bree, and escorts them to Rivendell via Weathertop, upon which the party is attacked by Nazgul and Frodo is stabbed. In Rivendell, he vows to aid Frodo in his Quest in any way possible, and joins the Fellowship. After Gandalf's defeat in Moria, Aragorn leads the party through Lorien to Rauros, at which point the Fellowship is separated. Aragorn then spends three days running across Rohan, with Legolas and Gimli, in search of Merry and Pippin. He takes part in the battle at Helm's Deep and takes charge of the palantir thrown from Orthanc by Grima Wormtongue. Around this point the company are met by the last remnants of the North Kingdom - thirty Rangers, led by Halbarad, and the sons of Elrond. Aragorn then leads the Rangers, the Peredhil, Gimli and Legolas through the Paths of the Dead so they can defeat the corsairs of Umbar and thus make it to the Pelennor Fields in the nick of time. Following this victory, he spends some time healing the wounded, and then leads a portion of the armies of the West to the gates of Mordor, to buy Frodo some time. On his return to Minas Tirith, he is crowned king and marries Arwen.

Aragorn in film canon
Aragorn is bearded and filthy, and thus strangely attractive to fangirls. His character remains true to the books, however, though his relationship with Arwen is expanded upon greatly, drawing much information from the appendices of the Return of the King.

Aragorn in badslash
As Aragorn is manly and unwashed, he must logically be the seme to Legolas's pretty blond uke. As such, his relationship with Arwen is either a) a sham to prevent anyone noticing Aragorn and Legolas's relationship, b) completely nonconsenual, with Arwen portrayed as the Bitch Queen of Angmar, or c) doomed to fail so that Aragorn and Legolas can get it on unimpeded. While all three can be written well, this is rare, and the majority of badslash simply fails to recognise Arwen's existence at all. Aragorn has usually met and fallen for Legolas at some point during his youth in Rivendell; he is usually but not exclusively at least thirteen when this meeting takes place. Aragorn chooses to join the Fellowship so that he can escape Arwen and/or shag Legolas in many scenic spots. As Elves are not human, many authors feel "their biology is different!" is a suitable excuse for mpreg, leading to such horrors as Elleelen, the product of Aragorn and Legolas's complete inability to keep it in their trousers, although Elleelen himself was, fortunately, dealt with in a timely fashion and crushed to death by the crowd at a Led Zeppelin gig.

Aragorn is not exclusively paired with Legolas. Sometimes he has some kinky sub/dom fun with Boromir. Sometimes he has wild orgies with hobbits. Occasionally he gets a bit Freudian with Elrond. He is one of the most frequently exorcised characters in the multiverse.