I'll help describe the bard. :p
Think of every rogue-ish hero stereotype ever. Freaking save the lady, say a clever quip, do the ridiculously impossible and do it all in a sexy open shirt.
That's the sorta hero Marion was. She slew dragons, slept with a minor nature god, once slew a not-so-minor god of destruction, and has probably deflowered her own continent's worth of virgins.
Now, she is now retired. Her concerns are less "save the world" and more "Varric wtf you didn't even seduce that young maiden I raised you wrong boy." She wants to inspire her son to be the sort of hero she was.
Now, since Varric has had a considerably easier childhood than her, he's kinda spoiled. As rogueish as she is, Marion actually does NOT like some of Varric's pranks. Many are funny, she feels, but they really can be assholeish.
She's like an older ultra badass Varric who is actually responsible. She's the crazy awesome war veteran vodka ain't that you can trust with your kids.
Also, she loves to tell stories. Mythology, personal anecdotes, bold-faced lies, all her favorites.
Also, she always seems to be in a good mood. In combat, even. It's...actually kinda off putting. Like, one of her bffs could die in front her and she'd be like, "ha, villain! You may have roasted my son to death, but you'll notice that I'm the one who's really on fire!"
She just puts off emotions until she can talk about them with a friend.
Oh, also, she is the ultimate MILF. Seriously. The seduce is strong with this one.