Hi folks, I need your help on this one.
I made a male Surana and the plan I have is for him to romance Morrigan. But the thing is that this Surana is a decent Elf. He helps people when he can, he is against slavery / pro freedom and he is against defiling ancient relics. He understands the necessity of the Circle even though he is against it being policed by the religious and prefers to be supervised by those who understand magic (so pro-Circle but anti-Templar). Essentially he is a neutral / good Warden.
The problem is that Morrigan goes against all these things. She disapproves when you try to help people, be it in Lothering or Redcliffe. She disapproves of the idea of the Circle of Magi completely. She disapproves when you try to save the Elves in the Alienage. She disapproves when you try to save the mages and when you want to destroy the Anvil of the Void (though the persuasion dialogue negates this somewhat). She disapproves when you do not do as Kolgrim asks. Lastly, she wants to condemn an innocent child to the burden of carrying the soul of an Old God for no clear reason (she never explains why she wants to have the soul in the first place).
So how do I romance Morrigan as a good / neutral Warden without just making her stay at camp all the time / bribing her with jewelry ?
Or do I just make him go for Leliana instead ? But how do I reconcile the fact that Surana finds Chantry & the Maker to be a load of hogwash (or he finds the whole Andraste-Maker thing to be a woman falling for a Fade spirit and nothing more) ?
Or do I just go forever alone with him ? 
Beyond just your warden's inclination to be more of a 'paragon' vs a 'renegade' (to use Bioware terms) I think the bolded is the biggest reason you should romance Morrigan. You could look on it as a 'rivalry' thing maybe. Something that "I can't help loving you, but you're a crazy b****" might fit. A romanced Morrigan still has Kieran, only it's a normal Kieran, not an OGB. You can romance her, still refuse the DR and in the end, she ends up with your love child (allowing you to go with her at the end of Witch Hunt). I THINK. I've never been able to successfully complete her romance (too much angst for my taste) but I don't think refusing the DR kills it. I believe you still get the 'romanced Morrigan' ending if you don't do anything else (like actively break up with her).
Even refusing her the OGB, she will still leave, but you can head canon this was 'that wicked fight that was the straw on the camel's back' kind of thing. You refuse to give her what she wants, she can't bear to watch you die against the Archdemon. So she leaves you, brokenhearted and hating herself for being so 'weak'. Going into Witch Hunt might be more about you have learned living without her is so much more unbearable than being with her, regardless of the tempestuousness of your feelings for her. You can even RP that her 'reason' for asking you to do this is because she can't bear to watch you die when she knows she can prevent that. All kinds of good RP opportunities here.
Any disapproval can be boosted by FeastDay gifts if you have that DLC, and she gets tons of gifts anyway, jewelry, the golden mirror etc. Just leave her behind on those missions you know will cause a LOT of disapprovals, and those that would be deal breakers for you (like when confronting Caladrius in the Alienage or talking to Caridin in the Deep Roads).
For roleplay, you can imagine your actions, your nature--strong yet not backing down from kindness, heroism--seeing you succeeding, are breaking down those walls she's put up to protect herself from love and/or real intimacy--backed up by her actions in game either romanced or friended.
If you have any other concerns I'd recommend the Morrigan thread in the Story/Campaign section where you will find people more knowledgeable about the witch of the wilds and who may be able to help you a little better. Link provided:
http://forum.bioware...-again/page-639
Another note: It is possible to have romanced Morrigan and still impregnate her with a normal child and have romanced Leliana, but in Witch Hunt, the romance flag must be present to go with her into the Eluvian. I just checked on my Keep and am using a world state 'normal son with Morrigan, but ended with Leliana' Cousland warden. So he had the child, but let him go with his mother. Just not sure if the flags work properly to achieve this state in vanilla Origins.
Talk about deadbeat dads 
Altering my worldstate a smidge shows that you can romance Morrigan, refuse her the DR and she ends up pregnant with your child. In the end you can go through the Eluvian with her, but can't have any other romance active. So it doesn't break the romance by Keep standards, just not sure you can achieve it in Vanilla Origins with the nightmare of bugs and screwed up plot flags that were left in the unmodded game. If you have Origins on the PC I'd recommend the Morrigan Restoration Patch by Terra Ex which fixes some of her broken flags/dialogues and run that just in case.