Would your LIs from each game get along with each other?

Two of them already had sex once. Sera would surely get along with Isabela, and Sera's fine with Leliana.

Fenris and Dorian... yeah I don't think so

Elven Glory!

Zevran & Solas - Zev would try to flirt with Solas, and Solas would immediately turn it around on him leaving Zev a terrified yet blushing mess. Solas would admire Zev's loyalty and fearlessness in regards to the Warden and their adventures, and while fending off Zev's shenanigans would be curious about his life among the Crows.

Fenris & Zevran - As seen in DA2 they would not have much use for each other, initially, but after prolonged exposure would probably learn to get along, and possibly have a drunken hookup. Would likely at some point start comparing scars and traumas much like Deadpool and his girlfriend.

Solas & Fenris - Fenris is basically every one of Solas' nightmares come to life, so he'd be torn between attempting to fast-track his plans to destroy the world, or trying to figure out how to remove Fenris' tattoos (if Fenris would let him) and then showing up in a dream offering him a job in his rebel army (if Fenris refused he'd spin the dream off into something else or make him forget); Fenris would have Solas' number pretty early on, and tell him it was futile to try to overthrow the Magisterium, and that more magic just made things worse - which would be cause for plenty of arguments between them, and Solas would be constantly having to bite his tongue not to give away major secrets.

Leliana, Isabela and Cullen. I would go with orgy. Leli and Issy are guaranteed to have sex.

Hm. I bought and beat Saints Row: Gat Out Of Hell recently, and I can't think of any other games I'm more excited for than I am for DA2. Maybe all I'm waiting for is a decently long block of days off work, like the one I have starting when I get off work Wednesday?

aight here we go

Sera and Fenris - they'd get drunk on a rooftop in Hightown and bitch about magic and privileged nobles and how scary it is to love someone. Fenris has a surprisingly juvenile sense of humor (look how often he giggles at Isabela and purple Hawke's stupid sexual innuendos. He made a poop joke in MotA. He's trash I love him). Gentry would be pissed that bottles keep flying from the windows of Fenris's mansion, can't do a damn thing about it.

Zevran and Fenris - Fenris is possessive and didn't appreciate Zev hitting on Hawke in DA2, but provided there's no more of that I think Fenris would appreciate Zevran's skill with a blade and his doggedness with regard to the Crows. Zevran would be charming and Fenris would be dour and Isabela would be very excited. They could DPS anything.

Sera and Zevran - First off, she'd think he's old, but also great fun. She might even recognize him from that time he and the Warden dropped off a small painted box to a certain little girl as a favor to Red Jenny. Sera would pick all the locks and Zevran would make sure she gets away with it. He's like the weird Antivan uncle she never had.

Fenris + Dorian

They would not be bored while discussing opportunities.

In my world: Georg Hawke: Anders – Willard Trevelyan: nobody, but has a crush on Cullen. So then: Anders + Cullen... I love that idea...

But yes, Solas would sympathize Anders, and probably they would not be bored while discussing the spirit/demon problems... But Anders would sympathize Solas? At first of course... but later?

If I'm going to be documenting it, maybe it's even worth reinstalling DA:O so I have a DA:O save folder for DA2 to read.

I think I'll do that now, so that I can beat Awakening with my second DN before Wednesday. (Maybe the campaign's short enough that I can do that?)

The whole game with every quest is ~40 hours +Legacy (~5-7 hours, maybe less). 
But I suppose in DA2 worth it to do every quest, because the characters are the interesting, and the main campaign too short to know them.

~15 hours? As I remember. And Anders/Justice/Nathaniel the most interesting, storywise party.

yas gud