As the title states, Kumiko will not be in event chests for Vulpacea on 11/24/2025. Do not waste event keys trying to get this mythic because she will not be available. (Fenix is pretty good and Stellarix is only available in the soulforge, so take that into consideration).
Seriously, put an asterisk* or some other symbol (maybe an anvil) in the right hand corner of the troop card to indicate that these PvP shop troops cannot be gotten normally. Keeping track of this is confusing when it can be fixed so easily.