Thread:Mystic20/@comment-25156300-20190811000931/@comment-25156300-20190811154701

There are character creators or you can get a commission. Even if you don't care for the design of the character creators, it is the easiest method that is free.

You can also practice editing by taking a screenshot from the anime and tweaking larger parts of the design. (If there is short sleeves, make it long, change the style of the hair, etc.) It may not turn out the way you want at first, but the art doesn't need to be perfect to use for a character.