Yori is a shy girl who has a lot of difficulty speaking to strangers, especially men. She tends to stumble over her words and yell out without realising before often running away once becoming overwhelmed. However, she is surprisingly stubborn and continues trying no matter how many times she fails, and has been shown to have a more domineering side to her where she isn't afraid to tell someone off for bad behaviour (though she does this without realising it).
Yori is also shown to talk to herself, often to reassure herself or psych herself up, but also to criticise her own mistakes.
(Source: Princess Connect Re:Dive Wiki)