Creating a new original character for your own use can be both an exciting and scary time, not just for you, but for those who will be hearing about your character in one way or another. That is the main idea behind this guide, to give you some ideas to think about when it comes to making your own character (also called an OC).
Come up with a good background for the character:
One thing I can't stress enough is to get at least a decent idea of your character's history before whatever you decided on as the "present time". Things to keep in mind here would be the relationship with parents (if any), natural tendencies while growing up, relationships with friends, things like that. Now I'm not saying you have to have every single little nuance down before you go anywhere else with it, you can paint the background in some fairly broad strokes zooming into one or two major incidents that help shape the character's personality today.