Froggy wrote: Judging by her attitude, a lot of people might fit that definition
Derrick thought before leaving
Nash shouts out Derrick saying in stern tone.
Derrick before you leave I think that Yang might want to talk with you.
Nash knocks on Yang's door who's room is right next to Yins and Yang answers it with a cheerful look on her face saying in joyful tone.
Yang: what is it Nash with you bring wonderful news?
Nash: yes Yang will be going with us after all thanks to Derrick.
Yang: oh that is such joyous I will go thank him!
Yang then disappears in a flash of light and nearly instantly appears in front of Derrick saying in cheerful tone.
Yang: thank you kind sir , I appreciate what you did for my twin sister Yin this calls for hugs yes!
the door to Yang's room is still opening reveal that it is bright & cheery, that it just looks totally upbeat in design. even the stuff that's in the room has a sense of cheeriness to it. even the clothes that Yang is wearing expresses a upbeat and cheery attitude.