Alot of the time a manga will begin becuz someone has a flash of a character in there mind, and they like wat they c. however many times iv found that i have just to many ideas for the characters provided. wats the solution to this problem? well u can either forget ur good ideas, which is frankly a pretty awful idea. OR u can write down all ur ideas, take a break, and then later on u c which of the ideas u rly like, and which ones were just a passing thot. Iv been developing the characters in my manga over 2 years now, becuz alot of the time i was indecisive on how they should b portrayed. So what i decided to do was to play around with different story lines, powers, character builds, relationships, introductions, the whole shabang. If i didnt get deeply into the story after the first week, i would take a few weeks off until a new idea came to me, and eventually i would find places where i could place in the characters i rly became attached to. Eventually if u picture ur characters in different scenarios ull make them perfectly to ur liking, and ull have a beautiful array of original characters.
hope u enjoyed my tips on how to refine and design manga characters