hey just to apprise you, twitter is micro-blogging platform, not a blogging platform. you should understand the difference.
Maximum character for Twitter is 140. You don't need a blog if you are creative enough to use 140 characters to draw traffic.
You can customise your twitter account to show your unique identity. This customization mainly include it's theme.
I'm not even a big fan of twitter, just seems like a wast of time to me. but hey maybe I just haven't figured it out good enough yet lol