Check the full patch notes below:
Three new characters were released with this patch.
Isabelle is a PVE beast, especially when you get her EE.
Victoria is another great PVE character, and she also requires her EE to shine. Still, if you have to pick one between them, go for Isabelle.
Sadly, Charlotte is a terrible character, so just get her from the event (she's free) and keep her in the barracks.
All three characters were already added to the tier list, so check their ratings before pulling.