Yay, I've been looking forward to this! Kain will likely have at least one dream from each god, but I'll also leave him open some nights to go hop into others' dreams as well. I'm finding that there's some overlap in places so I may not play them ALL out, but will assume dreams have happened for all gods! Some potential plans for him:

Delight: Flying on a dragon!!!, being under the open sky on a mountainside, being IN THE SKY, basically... he misses the sky ok. :( This one will be bittersweet for sure.

Rage: This will probably involve Kain fighting/killing Cecil, watching Rosa/Cecil kiss, other manifestations of his jealousy

Sorrow: Reliving his father's death, betraying everyone, Rosa/Cecil being a couple- ah, hell, that issue will come up a lot throughout this. Also, reliving his OWN death and being helpless to help his friends in Dissidia.

Hope: ROSA. He'll finally win her over. Probably something with winning his father's approval or defeating his darkness somehow could show up too.

Fear: MIND CONTROL, Golbez/Zemus taking him over, fear of Chaos taking him over, fear of being a traitor, fear of his inner darkness... This dream will involve imagery like Kain being a marionette pulled by strings showing his puppet-like nature. Enclosed spaces will also likely feature here, probably something creepy wherein he's buried/undead just because that level of confinement would play nicely into his fears... also it's October, time to be spooky!

Love: ROSA. Here we go again, ahaha!

Confusion: MIND CONTROL again, maybe. Also being trapped in the endless war of Chaos... and something really confusing and mind-warping that reflects his experiences with amnesia.

Tranquility: This would involve being at home in Baron, in some time period prior to all the mind control. Being with his friends, being with the dragoons, things like that. Maybe also hanging with his Dissidia friends and feeling like he belongs among them... perhaps they even appear in his home!