If you're one of those people, worry not! pixiv users have got you covered with a huge variety of resources that will help you with character design!
First of all, you will learn the basic way to think about character design and expand your ideas while looking at other creators' characters and setting materials. You can also work on your character by using a character personal background sheet. Even beginners will be able to learn from pros what character designs is and how it works. You should definitely check these resources out!