Unit Analysis by Team BethelFrankel
Class
Detonator that scales well on long stages.
Overall
S
Advantages
+Scales extremely high on longer maps
+Best base ATK among Thunder characters (with further ATK scaling on Equipment)
+Diagonal attack
+Active DPR is relatively high for bossing (and grows quickly)
Disadvantages
-Limited hit mechanics limits some of the AoE potential of her active
-Column chain combo, makes positioning key for maximizing its damage
Explanation
Primer on how Revy's active works: Each Thunder wave occupies one column, and each hit will cause that wave to lose damage regardless of if that hit hits the same enemy multiple times. If you count the starting stacks on her Equipment, her DPR is 120.8%/96.66%/78.8% starting from on turn 3, vs 1/4/9 tile enemies respectively. If we use Charon's DPR as a baseline (112.5%/93.75%/87.5%), we can see Revy exceeds him on small or medium enemies from the first use on turn 3, but usually needs to wait until her second use (turn 6) to exceed him on 9 tile enemies.
Overall, Revy is comparable to Charon in more ways than one (similar AoE on active, diagonal attack, etc.), but she drops his utility in favor of better scaling damage. The damage difference is significant - she is probably better than typical S level Detonators because of it, but having non-traditional scaling and no utility is quite painful. Notably, she will also still need to wait a few turns to exceed a captain Tessa's active DPR (although Revy is superior to her as non-Captain).