Saki is usually happy although just like her online "best friend" Yukio who she is oblivious of her crush  on she had a horrible bullying experience and almost commit but her twin brother Choka who is Grumpy and loves bugs and walking in on her saved her life. 
She believes in the benefit of the doubt and yet she cry whenever she gets hurt. She isn't very clumsy but often knocks things over and is over friendly to the point she seems pressing and loud and has no sense of stranger danger/ safety 