Hmm yeah in one of my first playthroughs I could've sworn I had a heart or 2 for him. In my latest one it just seems stuck at zero. Also I can't seem to unlock the scene where you humiliate him and walk him around the ship. I thought the bar scene with him would unlock it but I can't seem to start it again. Nothing pops up when I talk to him on the bridge.as long as you defeat him before you take out arahama then you should be on his romance path. Hugging him also gains his favor but so far that's all we got for his romance path. He's not that popular so it's going to be for a while before he gets content.