Fenris and Anders....that's one of the worst possible combinations to have together in the party....mages this, templars that...so utterly tiresome to listen to. Nah, it's funny banter all the way for me.
For me I often brought people on quests who have no business being there because they offered (often disapproving) dialogue.
Ex: For mage missions I often brought Fenris even though I was always supporting the mages and he'd help me regardless.
Fenris: "Let's kill a templar... Clearly that will help."
For "Mirror Image" I brought Anders and Fenris because those two bicker all the time.
Merrill: "They acted like I was a monster."
Fenris: "You are a monster."
Again, I brought those two for Merrill's Act 3 quest "A New Path" because of how much they disapproved of what Hawke was helping Merrill do. I laughed when Anders said "I don't know what I'm even doing here" as we hiked up Sundermount to summon the demon.
During MoTA I brought Aveline and Isabela because they don't get along.
Isabela: "You hear that Hawke? I'm a force of nature."
Aveline: "So is plague."
I made sure Isabela was there for The Long Road when Aveline wanted to court Donnic. My Hawke just loves trouble.