Is Hello Kitty Legal?

Hello there, I'm curious about the legality of Hello Kitty. Could you please clarify whether Hello Kitty is considered legal in terms of its use in various contexts, such as merchandise, promotions, and other forms of commercialization? I've noticed it's a popular brand, but I'm unsure if there are any legal restrictions or regulations surrounding its usage. Thank you for your help in shedding some light on this matter.