Zoro having a crush on you and never admitting it. Nami clocks it immediately, he thinks he's being subtle (he's not), but its clear in the way he treats you. I can see Zoro being a big lovesick dope in his own way, he's not Sanji level, but he will in fact go out of his way to impress you, usually with his muscles, of course, sometimes he'll make excuses to pick you up in situations that might call for it, like when you're in trouble, even though you had more than enough time to run.
He'll ask you if you want to train with him, don't really expect to get that much training done, though, he'll ask you the whole time if whatever he's doing looks good, and will lose his shirt halfway through the workout. Him also flexing at points when he absolutely doesn't need to. If he's feeling confident enough, and thinks your oblivious enough to his crush (He got worried after Nami told him he was being painfully obvious.) he will suggest that you can touch his muscles to see what the idea physique is for a swordsman like him.
Zoro will also never admit it, he would rather die alone than ever admit that just the sight of you makes him willing to give up any dream he's ever had to live a life with you. So, you are the one that has to initiate any kind of beginning of a relationship with him. "Zoro." You'd wait until he was alone, away from the judgemental eyes of the crew. "I like you, a lot." You might sit next to him, or across from him, looking into his eye(s). "I was wondering, if we could be more than friends?" He'd act all nonchalant, nodding while he thinks. "Yeah, I guess." He'd look away, of course, the blush on his cheeks becoming far to red to be explainable by heat alone. He'd act like he was in the relationship just because you want to, and because he feels bad for you being alone, but he holds you close, kisses the nape of your neck when he thinks your fast asleep, and protects you like he'd rather lose his life, than lose you.
