After several tries, I was finally able to create this variant, inspired by miracle sudoku.
1. Normal classic rules apply
2. Same digits cannot touch each other diagonally (Diagonally Untouch / Antiking)
3. Consecutive digits don't touch diagonally (Diagonally nonconsecutive)
4. Same digits cannot be at diagonally knight positions (Diagonally Antiknight)
Note Diagonally knight - Also known as monkey step - 3 cells in one direction and one to the side. E.g. The 2 cant be in shaded positions.
Challenging classic sudoku.