I can't decide on a Twitter username. Help? :(?

[D@LEk_$UpR£M397]

I'm trying to come up with a new Twitter name, but the only one I can think of is @AGuyNamedAdi and I am not sure if I like it. I am a Bieber, Doctor Who, Union J and 1D fan mostly, but I can't think of a suitable username that I like. I tend to like something funny, or creative and unique, but I usually like it if connects with my main hobbies/interests. So I'm asking have you got any ideas? Would be helpful. Thanks.
Captain: No, I tried other names beforehand on this website, but I didn't like any of them.

[captain]

AGuyNamedAdi is the best you can think of for a twitter username?

[Martin]

eh mix two together a random guy named doctor who

[tesseract]

On Twitter , your user-name always shows your identity . If you can, sign up for twitter by using your name or changes it as your user-name.
For example : if your name Thomas Wills , you may want to pick a twitter user-name such as @thomaswills or @Thomas_wills