Jimmy's female version, a.k.a. Rule 63

She's the antithesis of Jimmy from a parallel universe. She's shy, introvert and has an unhealthy obsession with Rebecca she tries to replicate her beauty, personality ...and lips...
Unlike Jimmy who refuses to accept he's having special feelings towards his teacher. Both are mentally linked and the two of them show their repressed feelings of each other, hence why Jacky feels that way to Miss Rebecca.

But don't let her weak appearance deceive you, she can pin down an average man if she's provoked!