Obviously AKB48! They're the best group in the world!
hello is better
It's the Cat Empire's 'Hello Hello'.
hello
Yes
No she isn't.
The song is 'Hello' by Cat Empire.
I think pucca is better
hello hello hello
She's not allowed to have a boyfriend because of her contract with hello! project.
beano
You might say "Hello, everyone" out loud, but I would not start a written sentence with it. It's better to be more formal when writing. Of course, if you have a character in a story who is coming into a place and saying "Hello, everyone!" that is different. Also, please notice that there should be a comma between "hello" and "everyone."
If your worrying about Hello Kitty taking over the world then you shouldn't be because as long as Hello Kitty company's stick with what there doing with there project, they won't take over the world. :-)