Although each transformation from Jennifer Walters to She-Hulk and back is created using CGI, Malia Arrayah plays She-Hulk on-set for having reference of She-Hulk size (her face is replaced by the Tatiana Maslany using CGI). Maslany is 5' 4" (1,63 m) tall, while Arrayah is 6' 5¼" (1,96 m) tall.
In November 2019, Kevin Feige stated that after She-Hulk is introduced in the series, the character will cross over to the MCU films.
In the show, Jennifer Walters/She-Hulk (Tatiana Maslany) is breaking the fourth wall or talking directly to the audience, and she is even aware of, and acknowledges, that she is a character within the MCU. Both of these aspects of the character were a major part of the 1985 graphic novel and continuing comic series entitled, "The Sensational She-Hulk" by writer/artist John Byrne.
Marvel's first full solo Hulk project. L'Incroyable Hulk (2008) was partly developed and distributed by Universal Studios. Up to this day, Marvel Studios still hasn't purchased the distribution rights to a Hulk film from Universal. This explains why a Hulk film featuring Mark Ruffalo could not be made despite Ruffalo taking the role in Avengers (2012).
It was announced on December 10, 2020 that Mark Ruffalo will be reprising his role as Bruce Banner/The Hulk along with Tim Roth reprising his role as Emil Blonsky/Abomination from L'Incroyable Hulk (2008).