Some characters are seemingly halfbaked or just never really tested.
Rackam can do the most damage in the game with his aerial Y
Ferry has a similarly high octane playstyle, spamming her jumping Y to gain lots of SBA and stunlock a boss
This is mostly because her damage caps are shit and this is the only worthwhile thing to do with her.
Multiple characters can just dodge cancel various skills or attack combos, like Id being able to dodge out of casting a skill and still get Sword Flurry or Percival doing the same to have fast charging Schlacht
Not to mention Perci's Roter Wirbel does around 10 million if you get a boss to stand in the full duration.
Eugen and Rosetta have an interesting interaction where you can do 10% or more of a boss' health in a fraction of a second.
Rosetta needs some buffs if they fix this though, she's not great right now damage-wise.
Personally I just hope they fix characters like Ferry that are boring as fuck to play and worry about any damage increasing bugs later.