A good Kraken is going to strong combo you. If you can space out a lot and keep distance so he can’t AoE you then Val is your medic for the quick heals (Caira can work and provides a certain extra utility in her speed boost). If your team aren’t co-ordinated then Rogue Val sops up the splash.
The trapper is really up for grabs, I’m not sure there is a really bad choice and it really comes down more to who you feel most proficient in.
Abe and Crow are good picks because they’ll keep the Kraken fighting to stay in the air. however this isn’t always the most important thing since a lot of Krakens currently alternate between ranged attacks then coming in for close blitzes. IMO Griffin is probably still the best against Kraken for all around utility, though doesn’t excel in any one way. WLM can absolutely fill this gap too since.
As others have said, an early dome is vital on Kraken, so Crow and WLM actually come out strong in this way.
Support I’d say it’s important to use either Sunny or Hank. The damage incoming in a short space of time is so much less of a problem with some shielding. That said I don’t think Cabot is a bad choice either as long as your team really knows what it’s doing to avoid damage and clearing banshees.
I’ll defer to the assault players on who the best Assault is, I know people say Torvald or Markov in general.
So if it were me, who would I want?
Val for the strong heals and slows
Crow to search out feeding paths quickly with Gobi and keep a good stasis on Kraken from range
Hank to shield out the combos
Markov to keep popping the banshees and applying the damage.
I feel it’s more important than anything that everyone runs movement speed or jetpack recharge as their perk too.