Having a sweet, wide-eyed, awkward character is more charming and allows for more range. If you come from anger, you're going to reach a ceiling very quickly.
My accent has changed my whole life. When I was younger, it was very Nigerian, then when we went to England, it was very British. I think I have a very strange, hybrid accent, and I've worked very hard to get a solid American accent, which is what I use most of the time.