Crypt of the NecroDancer

Diamond is one of the extra characters added in the Amplified DLC. He is actually a very easy character compared to many others in the game. His gimmick is that, with default controls, the X, B, LB, and RB are replaced with the diagonal movements of up left, up right, down left, and down right, respectively. Because of this, he cannot use spells, backpacks, or any equipment that requires activation. He also cannot throw daggers or spears or equip weapons with a wide range, like whips and broadswords. This restricts his item pool, but other than that, he functions exactly like cadence with the option to move diagonally. Personally, I forgot about the diagonal movement entirely during my run and beat it normally.