jfc guys shapeshifting doesn't immediately make a character into a mary sue. you won't know if it's a mary sue or not until you know more information about the character.
here is an actual mary sue that i drew for some random person for free on vore amino: (vore)
It might be due to the shape shifting ability, a tell tale sign of a mary sue
a mary sue is either a character with zero flaws or a sob-story character with all the flaws and nothing positive. if you have a character, take this test: http://www.springhole.net/writing/marysue.htm
~snip~I'm nutting