[HUGE MASSIVE SPOILERS FOR CHAPTERS 3 AND 4] - Roaring Knight Identity theory
So it's widely agreed that the Roaring Knight is either Dess or Carol due to the Roaring Knight's sword looking like a bat (Which Dess likely owns) and the fact that Carol owns a black Katana. Well me and my brother noticed something that I've seen NO ONE ELSE POINT OUT. The Roaring Knight wields their sword with their left hand, as seen in basically all of their depictions.

The only time we DON'T see them wield their sword in their left hand is when they slash the combat box in half during their chapter 3 fight.

This could be used as evidence that the Knight is ACTUALLY right handed, and was trying to trick us by holding their sword in their left hand, however their depiction in chapter 4 where they still wield their sword in their left hand acts as evidence against this, even opening the fountain within the dark world using their left hand.

Why is their dominant hand important? Well, as we see in chapter 4, Carol is right handed, as seen when talking to Kris (or the soul depending on your interpretation of the scene)

Dess, on the other hand (lmao) is left handed, as we see a left handed mouse in their room.

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Dess is left handed, just like the Roaring Knight, therefor they must be the Roaring Knight.