Boss characters are usually but not always OP and some fighting games put them in a separate category. So what about Yuga? I would say they're not OP and no separation is needed. Can see my Easy no cards run is only 10 seconds faster than CesarD's no cards run with Charlotte. Plenty of my fights are slower. I'm only ahead due to being about 12 seconds faster on the chained monster fight with no mistakes.

I admit there is room to argue for a separation on Medium and Hard given the low likelihood that Charlotte's yellow triangle spam works. Yuga is super easy to play and can attack from any distance.

The counter argument to that is there's 15 playable characters, each with Bust and Slash sword types and I'm sure the majority of characters have never been tested. No attempt at AI manipulation and Yuga struggles in the mirror match. I lost the fight in my first two attempts on Hard, though I chose not to equip DEFENCE UP.

Separating just on Medium and Hard wouldn't be crazy but I don't think we have enough character research to do that in any case. I only tested with Yuga on Medium and Hard.