https://wccftech.com/final-fantasy-vii-remake-mod-playable-red-xiii/

A new Final Fantasy VII Remake shared online in the past few days introduces a fully playable Red XIII for the story chapters he joins the party as a guest.

The new mod also allows the character to earn experience points and level up, but he cannot use any of his abilities as he doesn't gain ATB when controlled by the player, so some limitations are still in place. Additionally, he is not playable during the battle against Jenova Dreamweaver.