The first appearance of Jojo shows her wearing a pink t-shirt and her hair in an afro. Her second appearance shows her in a purple flower dress and her hair in pigtails. In both appearances, she is wearing a silver necklace.
Jojo lives with her mom, Rachel, in a home in San Francisco. She was there when her aunt, Maddie, came over to look at places for her and Tom to move into. When Tom came over to Rachel's house to hide from Robotnik and to hide Sonic, she was more curious than afraid. She watched as Maddie got Sonic conscious. After seeing the alien's worn-out shoes, JoJo brought a pair of new red Pumas to Sonic as a gift, which Sonic happily accepted.
Jojo was seen running around the house mimicking Sonic and saying "Gotta go fast" while her mother was tied up in a chair later in the movie.
Jojo is a sweet, kind child, who, unlike her mother, is able to respect Tom and Maddie's relationship. She is a generous person as shown when she gifted Sonic a new pair of shoes. Jojo seems to be indifferent of her mother, ignoring her when she asked her to untie her from the chair, and later, wear her FitBit. She seems to admire and is entertained by Sonic's antics, as shown when she was running around her house mimicking his speed.