https://twitter.com/WhenWeAreHome/status/1245920372362444800?s=19

There are lots of great threads on this reddit which have discussed this even in the last week or two, so you might want to try running some sort of search if you can. Those threads tend to list the top half dozen really bad things that people do. Beyond that though you pretty much have to start defining your character. A lot of that will come from what you need that character to do in your story, so maybe describe the character a bit so we can talk about it.