A mod has been released for Resident Evil 2 Remake that turns the campaign into a full two-player co-op.
Each player has their own inventory and weapons. If your partner goes down, you can pick them up. You're not limited to Leon and Claire: the roster also includes Ada, Hunk, Sherry and other characters.
Difficulty is adjustable, so you can make your playthrough either relaxed or hardcore. If you finished the remake solo long ago, this is a good reason to return to Raccoon City with a friend.