I think Souda and Kuzu would be kind of cute, actually! Not specifying on what spectrum of the romantic fields, these two have character traits that would make for very funny and dynamic scenarios. In my opinion, Kuzu is pretty mature for his age despite his disgruntled personality, and could easily calm a freaked out souda in dangerous situations :'>
Momma Kuzuryuu is the best Kuzuryuu tbh. Souda clinging onto Kuzuryuu and Kuzu trying to calm him down from whatever Souda got upset from and just aaahhhhh;;;;
Not to mention my headcanons for Kuzuryuu and Souda to be somewhat of good friends back in the Hope’s Peak days. Kuzuryuu taking Souda under his wings and making sure that nobody messes with his ‘Brother’. I’m sure what Kuzu need for his disgruntled personality is bright and happy Souda to cheer him up.