The reason why Hashibira Inosuke is so attached to you is that you knocked him out for not calming down the first time you met.

After completing a mission, you decided to recuperate in the butterfly mansion. Coincidentally, Inosuke is there, when he sees you, he runs up to you as if he is gonna tackle you to the ground but instead, he wraps his arms around you with a little tight squeeze.

"Haha! Idiot! You thought I'm going to tackle you? I won!" He laughed as if what he said made sense.