Like who's the guy with the green face and horns?
Lorne's a colorful character.
Lorne, a.k.a. Krevlorn Swath of the DeathWalk Clan, is a Pylean (a demon whose home is the dimension Pylea). His people knew nothing of song, and he grew up lacking something unknown to him, but he knew was missing. He came to Earth after escaping Pylea, started a bar called Karitas, and made it a neutral ground for LA's demons. Angel's group had an accidental hand in destroying Karitas - TWICE - and he now works for them.
Lorne's a "Hollywood Type," through and through, and it made him a natural Public Relations man - er, demon. He's a real gentle soul, talks like a sweet-talking producer, and can read people's souls AND their futures, when he hears them sing.
Last episode, we got to see him pissed off; he can be downright nasty when someone he loves is dying. He had a special connection to Fred, because she spent 5 years trapped in Pylea, and she and he have a lot of shared experience of "Home".
Hope that helps a little.