Bear with me on this. These are not all the best in their class (although some are), but they synergize well, have 95% of the essential utility, and easily handle 5/6 of Cavalier (except for mutant):
Doom, Torch, Mole, Surfer, Warlock
nullify, power control, heal block, every immunity, armor break, evade counter, debuff shrug-off, armor buff, mostly tanky, destroy FF4 defenders, and good damage on all
Also, for Cav, if you need to double up on science, for example, you can switch out Warlock for Rulk or someone else without losing any of the synergies.
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Doom, Torch, Mole, Surfer, Warlock
nullify, power control, heal block, every immunity, armor break, evade counter, debuff shrug-off, armor buff, mostly tanky, destroy FF4 defenders, and good damage on all
Also, for Cav, if you need to double up on science, for example, you can switch out Warlock for Rulk or someone else without losing any of the synergies.