Lilly is the main protagonist of the "Really You" episodes.
At first,Lilly is an overindulged tween who gets what she wants,since she has a "gift" for manipulating her dad.
Her mother was often frustrated by her actions,as was her brother,as her brother felt she was in need of self control.
All this changed when "Lilly D." (the "D" being short for Deluxe) a life sized "Really You" doll,was purchased for the precocious tween.
Soon after,random "accidents" begin to happen;which Lilly is quick to blame "Lilly D." for,as Lilly was told by another girl who had been invited to Lilly's house,that "Lilly D. hated her."
While her mother dismisses the claims as being "rubbish",scolding Lilly in the process;her brother however,begins to suspect that "Lilly D." is more than just "a doll."
Eventually,her brother learns the truth behind "Lilly D." She is trying to replace her "human doppleganger",as Lilly D. is "evil and she wants to be human",according to the dollmaker who knows the truth about "Lilly D.",yet was ignored.
After a trip to the doctor,as Lilly had fallen ill,for no apparent reason,"Lilly D." reveals to Lilly she is alive,by smashing a vanity table mirror. Lilly's protests to her mother are ignored once again. As her mother walks away carrying Lilly D.,she remarks "I wish Lilly D. was my daughter,instead of you",before entering the bathroom for a few moments of relaxation.
Lilly and Lilly D. then swap places,with no one the wiser. The now human Lilly D. went on to explain she was "after her mother's love."
The "new Lilly" seemed to be a total reversal of the "old Lilly." She was sickeningly sweet,and polite.
During dinner that evening,she was praised for her new,unselfish behavior. Unseen by the family,the "real Lilly shed a single tear",which the "faux Lilly" wiped away,before anyone could see that her "mother" upset "the doll."
"Lilly" dismissed her father's suggestion that some new "accessories for Lilly D." were in order,by saying that she was "over dolls."
After dinner "Lilly" took "Lilly D." out to the trash container,to remove her from the picture. As "Lilly D." awaited the garbage truck the next day,"Lilly" told her "its good to be you." As an afterthought "Lilly" told the real Lilly,"I always hated you."
However,Lilly D's scheme was undone,as he brother discovered the switch. Imploring his mother to not let "Lilly D. be taken by the garbagemen",he gave chase to his "sister",as Lilly's mother discovered the truth as well;"Lilly D. was really Lilly." Lilly and her "doll doppleganger" were restored to their rightful bodies soon after. The episode closes with "Lilly D." being found by two girls who bicker over who will get the doll. The girls run away in terror as Lilly D. grabs one of their ankles,indicating she is still very much "alive."