I can tell you exactly, but if you were a Lady Gaga fan you could use HouseOfNicki or MonsterNicki, even NickiGaga. You get the idea ;)
A general rule is to keep it short. That way it's more room for the Tweet in a retweet.
No, usernames are unique.
NICKIMINAJ
Nicki Minaj's official twitter account is @NICKIMINAJ. You can easily find celebrities/noticeable people's twitter account by looking at the blue badge beside their name; If they have one, it means their identity is confirmed, if not, it means they might not be who they pretend to be.
(Fursona's name) Furry Or (firsona's name)(hobby or personality) (species)
Nicki Minaj announced her half brother Brandon Lamar & Nicki minaj's sister name is Vanessa.
MayaMarvel MayaMoonlight MysticMaya MayaMagic
Nicki does not have a god brother, but she does have a half brother name Brandon Lamar who is pretty well known for his rap career and millions of views on Youtube... you can Google the info. His Twitter is: @itsBrandonLamar
john
The name "Nicki" is spelled N-I-C-K-I.
miley
since you cant use your name use another made up name like naruto or yahoo or something
I think that Twitter is a very good dog name and it's very original and cool.