It's just the Overwatch characters,
Tracer, Mercy, Brigitte, Mei, D. Va (Hana Song), Widowmaker (Amelie Lacroix), Sombra, Ana, Symmetra became Sonya, Seraphine, Freja, Yun, Ava, Aurelie, Reina, Kamilah, and Sitara.
In which update was Blaze introduced? I don't remember seeing her route appear anywhere