With my charecters I usually have a few techniques to design them:
The first, ask my fans for ideas, they usually have a helpful input on my stories.
The second, mindmap any ideas I've got, rule out the helpful ones and combine them together for a successful charecter.
The third and final technique I do is I ask permission of one of my friends before using them as inspiration.
Here's some tips for you:
1) Be aware of the people surrounding you, everyday charecteristics, natural actions, features, appearance and you'll soon have a charecter.
2) Change your scenery, meet new people and use your findings for your books.
3) And my final tip is, ask your fans! If their that bothered in your story they will respond!
Goodbye and good luck :)
