White Tiger (Ava Ayala) is a fictional superheroine appearing in American comic books published by Marvel Comics. The character was created by Christos Gage and Tom Raney, first appearing in Avengers Academy issue #20.
This is going off the debut of comic book characters. In the cases of characters who were introduced in other media originally and added to the comics canon later along (ex: Harley Quinn) it'll go by actual debut year.