This is like asking me to pick my favourite freckle. 
DA:O, Alistair. I like that he and my Warden were not only lovers, but best friends. I know not everyone likes him, but I enjoyed the fact that in a friendly relationship, he jokes, he deflects, and then he comes clean. Considering his background he could have been a real jerk, but he generally wasn't. Unless he was around Morrigan. But Morrigan was my Warden's other BFF and the conversations in my head canon are amazing.
DA:A, Justice. My Warden was still very young, so even the concept of Justice blew her mind. She respected him, though, and since she was an arcane warrior, they had a weird bond since he was a spirit warrior. He was alien, and yet he managed to see all the beauty in the world that she couldn't from her jade coloured glasses.
DA2: Aveline. No ifs, ands or buts. She knows what needs to be done, she's brave, she's compassionate and pragmatic (a rare quality), determined, kind of a dork, and she keeps my Hawke focused. Sebastian is my Hawke's great love, but I attribute a lot of Hawke's general pessimism in DA:I to the fact that she doesn't have Aveline to bolster her up. Aveline is my Hawke's sister by choice.
DA:I, Dorian. Breaking the mold (I seem to have a thing for sword and board/mage friendships), Dorian was everything my Dalish Inquisitor was taught humans were not. Surprisingly, although he is very arrogant in some matters, he's also refreshingly straightforward. In a world where everyone is constantly hiding, fighting, and trying to get the upper hand, this tevinter mage with a well waxed mustache and questionable fashion sense admits when he is wrong, is willing to give almost anyone a chance, and threw away his pampered lifestyle on principle. She's working him over on the concept of slavery, and he challenged her beliefs on what it meant to mingle with non-Dalish folk. He's supportive of her choices, cheers her and Cullen on, and is generally the broest bro to ever come from Tevinter.
My alternate life Inquisitor, my canon Inquisitor's cousin/former betrothed, ended up falling head over heels for him.