Any of them good? I haven't even looked yet.
Lu Bu is tits. He's like an even better partner for Ronia than Ronia is. You trade healing for a little more HP and damage. And he's D/D so fits the typical devil color better. And has a 1 turn 2.5x attack boost so you can drop a Baddie for a real monster. Though you better be confident in killing them or healing up hardcore that turn since it drops you to 1HP.
Cao Cao is 1.35x HP 3x ATK to red and has a 1 turn delay that turns blues to reds. Add in his 1 red row enhance and he's an amazing Red/Attacker sub and a viable partner for Shiva if you haven't lucked in to him but have other good red row subs.
Blue and Green guys will be good subs for their colors.
D&Q are pre-UVO Horus with a way better active and a leader skill that includes Hearts as one of the 4 colors. I imagine some day they'll get a Uvo that brings their damage up too.
Red Guan Yu is Dragon leader, so garbage there. Passable red sub though with 1 row and 2 skill enhance.
Green Guan Yu is the same except for Physical. They seem to be filling out the ranks of green physical monsters so he'll become a viable endgame option. Though having the RCV to stay over 50% and keep his LS active might be rough. If you don't have a Parvati you might be fucked. You'd probably end up with a Green/Blue team and really want a Blodin in there as well for stats/awakenings.
Anyways, yeah they are very good Gods. I'll certainly be dumping all my saved stoned when it comes around. Hoping for a Lu Bu, Cao Cao, Rodin, Ronia, or maybe one of the Guan Yu's.