- Connie Thompson (rival)
Creepy Connie hired Mackenzie to play her boarding school roommate so that Luke will think Connie is over him and think Mackenzie really is Mad Mack so Connie could scare Luke right into her plan to marry him, but Mackenzie later reveals to Luke that she was never Connie's roommate and Luke isn't her type and later Connie goes way too far and ties Mackenzie up. Later on, Connie reveals that she spent all the money that she was going to give Mackenzie for acting in the "wedding" that she had with Luke
- Luke Ross (friend)
Mackenzie meets Luke in the park when she catches his baseball and pretends to have a crush on him and later she arrives at the penthouse and tries to handcuff herself to Luke but then Creepy Connie arrives to attack Mackenzie, and later she films herself under Luke's bed and says that Luke will belong to her forever, but later it is revealed that she is an actress and never crushed on Luke.
- Her Family
Mackenzie Is Stanley's Little Sister, She Is The Youngest Member Of The Griff Family, she and connie do not physically appear In Speedy Does It, and Connie Causes Stanley To Lose His Energy By Eating The Un Healthy Food, Causing Stanley To Lose The Race, And She Blames Mackenzie For It.
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