She is known for her role as Adam Torres,[1] the first transgender character on the long-running TV series Degrassi: The Next Generation, and as Lizzie McDonald on Life with Derek.

[2] Todosey was born and raised in Toronto, Ontario, Canada and began working as a child actor at a young age, making appearances in series such as Instant Star (2004–2008), Life with Derek (2005–2009) and Flashpoint (2008–2012).

Her portrayal of matters involving transphobic violence, coming out, and gender transitioning received praise by audiences and LGBT+ organizations.

Bono stated that Todosey's character was "spot on" in the experiences of transgender people in high school and had helped one of his group members discover their own trans identity.

[16] She also appeared in one episode of Flashpoint; in The Pacifier as a Firefly (Girl Scout); and in The Prize Winner of Defiance, Ohio as Tuff Ryan at 9 years old.