I can't choose only one, but I really like red, white, grey and black

Hi!
I think if you don't have an idea for a character yet, you can just draw some shapes, or expressions on a piece of paper. Think about their size and proportions. You don't need many parts and details on them, it's better when they look simple but original. Use some colors for them, like 3-5, feel the balance
This turorial helped me