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Upon moving into P.S. 38, Ruby Dinsmore was constantly chased down by two students, Nate Wright and Randy Betancourt, who both had a crush on her. She gave Nate a can of soda pop when Artur Pashkov told her Nate was hungry, but when Randy shook it (something only witnessed by Drama Club President Dee Dee Holloway), the soda rocketed into Nate's face, shocking Ruby. Ruby eventually chose Nate; they got together when Marty Wright told Nate and his friends that they are not moving to California, which made an excited Ruby kiss Nate, breaking Randy. Apparently, Nate began to date Ruby. Randy waved her off, deciding that he could live without her, but he still kept his jealousy.
She first appeared in Big Nate Blasts Off, which was her first and only appearances.