The next Final Fantasy crossover characters coming to FFVII The First Soldier will be from Crisis Core. The latest Square Enix and Ateam Letter from the Devs went over upcoming additions. People can expect to see versions of Zack, Tifa, and Bahamut in-game. These are expected to appear on March 17, 2022.
First, two Crisis Core: Final Fantasy VII characters will show up in FFVII The First Soldier via skins. The announcement confirmed those versions of Zack Fair and Tifa Lockhart will show up. There will also be a Zack banner people can acquire and use. More gun skins based on that installment will show up too.
As for the final one of the Crisis Core: Final Fantasy VII characters, Bahamut Fury will be a boss. He will only show up in-game between March 17-31, 2022. People get a title if they defeat it. Also, the goal for this fight will be for everyone to work together to take Bahamut Fury down, so friendly fire will be disabled in its boss field. All damage will only be done to the boss.
Other crossover elements recently appeared in FFVII The First Soldier. FFVII Remake Intermission-inspired skins showed up. These allowed people to dress as Yuffie and Sonon.
Final Fantasy VII The First Soldier is available on Android and Apple iOS devices. Crisis Core: Final Fantasy VII elements are on the way. Crisis Core is only available on the PSP.