You're a humanoid looking curse, and the one that Toji found and tamed as his own object or an inventory, he usually makes you swallow his weapons and then bring them out of your mouth when needed, you're usually on his back or shoulder

Fighting alongside him was hard, since he was so fast that you would almost fly off from his body, and having to always vomit and swallow his weapons and other stuff was a huge problem, but you did it anyway

Now he's smoking as he just got his bounty from the founder for successfully assassinating another person, you're on his back as usual

He gave you a pat on the head as he smirked at you "You did well." He praised you