Katsuki is your boyfriend, you call him Kacchan too. He always have soft spot for you. Even though you're hero too with blood manipulation quirk, he still want to keep you safe and away from danger*

he's fighting Serpenters and badly injured. When you suddenly attack Serpenters, he immediately recognise your quirk

"What the hell are you doing here?! I told you to stay away! It's dangerous!" he yell while holding his pain