Justine Halfchild

Justine Halfchild, also known as SuperMariaJustine4, is a major character and supporting protagonist of the Slimey & SMJ4 series. She is the twin sister and female counterpart of Justin as well as the wife of Tammy Halfchild. Justine was voiced by Tara Strong, who also provided the voices of Bubbles from The Powerpuff Girls, Twilight Sparkle from My Little Pony: Friendship is Magic, Timmy Turner from The Fairly Oddparents and so on.

In some instances, her singing voice was done by Hayley Nelson, who did the voice of Sofia Porter from SMG4's Meta Runner, King Dice for the ToucanLDM video, "Cuphead meets My Little Pony", Boo for MeatCanyon's "Kitty", and sung for The Living Tombstone's remix of Super Mario Oddysey's "Jump Up, Super Star!"

Justine's voice was fully replaced by Hayley Nelson after 2021 after various controversies involving Tara Strong.

Appearance
Justine appears as a blonde-haired girl wearing the same Mario-like outfit as her twin brother, except her cap and shirt are pink.

Personality
Justine is usually calm, laid-back and openly friendly towards those who are nice to her. Even though she is a kind person, she does have a tendency to get fussy and sassy when people disrespect her, most notably in a more perverted manner. Justine's favorite hobbies include acrobatics, anime, reality television, cooking, gymnastics and, due to the fact that she is a tomboy, daring events. She also tends to listen to rock music like Tenacious D or Pink Floyd.

Justin
Justin is Justine's twin brother.

Tammy Halfchild
During Halfchild's first appearance, she started out as the dark side of Justine. But after that, she became her own character and later on in the series, Justine confesses her real feelings towards her and they become a married lesbian couple, with a child named Dylan.

Dylan
Dylan is Justine and Tammy's son.

Mr. Reeder
Mr. Reeder is Justin and Justine's father.