So BK & Sif have a really great synergy in that the “flesh wound” of BK can kick in but still counter for full damage:
However for raiding & titans I would say that Guin is the weakest link by far…
A sniper would probably be the best option to pair up with G. Jackal… so I would say either Joon or Poseidon… Of the two I would probably go Joon personally but both are great sniping options…
Then you can pair WR & Drake as a deadly combo + also Jackal & Joon for 1-2 punch.