>>10080964She's a very emotional person. Her passion is unusually strong, but she also seems to have trouble controlling it. Nonetheless, people call her cheerful because she tries to make other people happy and stays high energy around other people.
To some extent, being cheerful is a skill. The ability to be able to reject your worries, fears and insecurities and instead communicate a positive mood to other people is something that you learn to do instead of just being a way that people are. Remember way back in December when her channel got banned, she didn't get super sad about it? That's because she channeled her energy into making the best out of the situation instead of letting the anxiety consume her.