So many blood mages.

Damn, I didn't know things were that bad in Kirkwall's Circle.  No wonder there's so many that turn to blood magic in desperation.  In my next playthrough I am playing as a mage, and maybe they will show more about Ser Maurevar Carver and Hawke's dad.  In fact I did not know Hawke's dad was a mage.  I thought Garrett and Bethany inherited it from their mother's side since she's an Amell?  We know the mage Warden was a distant relative of Garrett and Bethany.  But I am looking forward to see the Garrett/Carver dynamic and find out more that I missed when choosing Bethany.

For the first part.  Sheesh, and the mages in Fereldan complained about their Circles.  That is why in every game I chose mages and which is why I protected Bethany until she went with the Wardens.  As for the second.  I look forward to playing that dlc and Mark of the Assassin.  I'll make sure to bring along Carver and Anders when I do that dlc.

For the Legacy DLC if you want the most out of the story the companions to bring are Varric, Anders, and Bethany/Carver.
Mark of the Assassin is more fair among the companions so you can bring really any of your choosing. 

Leandra explains to her kids, that her parents were cross with her, because with her marrying a mage, she brought more magic into the family - and as we know from Connors example, magic isn't a cool thing to have in Thedas high society.
I think, you only get the whole Ser Carver and Malcolm story with Carver, since this is, what Carver fins out about himself and his connection to his fathers past. Bethany finds out about how much she looks like young Leandra and is happy about the prospect of living in the family estate again, Carver wants some connection to his dad, because he feels a bit left out, not being a mage and therefore not being trained by his dad like Hawke and Bethany.

Looking back, I'm kind of disappointed that Warden Bethany or Carver didn't also hear Corypheus' whispers. Maybe not to point of temporarily turning on the party like Anders, but should have sensed something.

I used to be pro-mage revolutionary and ran off with Anders 'cause he's so dreamy but now I'm starting to get really mad at Anders for not recognizing even a little bit how ridiculous the blood mage problem is in Kirkwall and just how stupid some mages (as humans) can be. He ridicules Merrill for her stupidity and doesn't realize that it's exactly that individual stupidity that requires some amount of regulation. It's extremely political.

Anders knows it’s an issue.

To understand, you need to look at the problem as a tier.

The veil is thin in Kirkwall and combined with how poorly mages are treated compared to Ferdelan it’s a recipe for disaster.

So, the mages are left with several choices.

Kill one self

Submit

Runaway

Turn to blood magic

Be made tranquil

Most mages who turn to blood magic in Kirkwall do so out of desperation.

During the quest, “On the loose” if you take Anders with you, he’ll point out of the fact the reason people turn to demons/blood magic is due to how bad the system has become, thus forcing mages to take drastic measures just to be free.

Mages would not need to turn to blood magic/demons if they were not forced into such deplorable system. This is what Anders wants to stop. This is also why he is so pissed at Merrill.

Anders understands why mages are doing what they are doing just to be free. He does not agree with it but understands it.

With Merrill however, she had a good life, a good family and she threw it all away just to reclaim some lost relic for her people and turned to blood magic to do so.

Merrill had a life every mage in the Kirkwall Circle would want to have, but instead of Merrill seeing this, she just tossed it away. Merrill is one of those people who cannot just be happy with what she has - no she wants more. And for Merrill to get more, the price of it will be the life she had.

Anders does not like blood magic/demons, he is not as vocal about it as he is with Merrill, but his reasons for being more vocal with her are understandable and well, obvious. 

Merrill is the type of person whom The Chantry wants to protect people from. That is all fine and good, but not every mage should be locked away for one persons stupidity.

Good!

Fenris' reaction is very different in rivalry and in friendship.  In the first, rivalry version (video) he blames Hawke to bring him to the Fade, in the second, friendship version, he apologizes.
Aveline, yes, she blames the mages. I have just the rivalry scene, I suppose she's not that different in friendship (I didn't bring her here before) – but her rivalry is so good.
 

You don't need to apologize, I don't know about many things. Yes, he's not happy, but I like to bring him everywhere. He's an interesting companion, at first I didn't like him, but he's more than first sight. Mostly friendship, I tried the rivalry not in romance, but I prefer the friendship here, while in romance – depends on Hawke's templer – I like both.

I don't know about how Aveline behaves in friendship here, the attached video about a rivalry. So: while I finished the game in many times, I don't even know every scene.

Yeah he's th eone that becomes prevalant in Anders's quests