Illic Nightspear
Basicly, this guy is a fuckold eldar who has followed the path of the Outcast for thousands of years. Over time he has grown fond of bright colors and bad jokes, thus has developed a clown fetish of massive proportions.
He is supposedly looking for lost paths in the webway, which means that he has fostered powerful relations with the harlequins...(mostly the women), leaving thousands of bastards that are almost as badass in the ways of sniping and stealth as he is, known as pathfinders by their more pussy bretheren, the lowly rangers. He has a string of broken hearts, pissed off exes, and baby mommas so long that it rivals Vance Motherfucking Stubbs' harem. It would be impressive exept that its taken him a fuck billion times longer to do, thus further cementing humanity's glory.
Illic sometimes decides to give some of his knowledge of the webway to Craftworld Alaitoc, whose close ties to the Harlequins lures him in for the chance of getting some of that multicolored ass.
The pathfinders whisper that Nightspear is supposed to be off preventing the cataclysm known in eldar legend as the Rhana Dandra, where all of the Phoenix Lords will gather and face their final deaths, but there are so many legends about him, (mostly about how he pursues dat space clown ass), that it is difficult to be sure of his intentions. Regardless, his presence on the battlefield is a great asset to Alaitoc, and he has ended conflicts with his ability to 360 no scope imperial generals, Necron lords, and various other enemies of the eldar with his rifle that can teleport people into the warp.