Taldeer
Taldeer is an Eldar farseer originally featuring in Dawn of War: Winter Assault expansion and the second expansion Dark Crusade, strangely, both times as the leader of the Eldar faction. She is most well known on /tg/ for being one of the protagonists of the awesome piece of writefaggotry known as Love Can Bloom, alongside the Vindicare assassin LIIVI.
In most drawfaggotry not actually directly related to the content of Love Can Bloom, Taldeer and LIIVI are assumed to have somehow escaped from their predicament in Love Can Bloom and are living happily together on Ulthwé or something. They optionally have a child known as Lofn. Taldeer is sometimes depicted as a daughter of Farseer Eldrad, with Macha being her sister. Fellow Farseer Caerys has a bit of a thing for her.
Recently, it was believed that Macha shot and murdered Taldeer in her sleep for being an insufferable bitch. It is unknown whether the story is false, or whether Taldeer was raised as an animate corpse at the bidding of her father. Considering the story took place when Macha was fifteen and doesn't mention LIIVI, more than likely it took place only within Macha's own mind.
It was revealed in Dawn of War 2: Retribution that Taldeer was killed by the Blood Ravens (As told by Azariah as he taunts Ronahn before the Exterminatus). As Ronahn was her brother, the eldar campaign is all about saving Taldeer's soulstone. Which is gay.
In Dawn of War Retribution it is firmly believed that the 'Good End/Epic End' is a combination of the Space marine and Eldar endings. The Blahd Rehvens get their chapter purified, Gabriel Angelos becomes the new chapter master (with even moar manly scars). And Taldeer's soulstone is recovered by her brother and is taken 'home' wherever that is (presumably Ulthwé because that is where they are both from.) Though it is likely she'll show up later as a Wraithseer (wraithlord for farseers). It is also known that Lofn escaped before Tadleer's death/soulstone transmition, her current whereabouts are unknown.
However, this will never happen. THQ went under, so it's highly unlikely that there will ever be confirmation of what her fate really was. Edit: Sega picked up both Relic and the Warhammer licence, so there is still hope!