Jimin has been labeled as the most romantic one of the boys, and I don't doubt it. He seems to be very caring and affectionate, along with being very considerate of others. He likes to make people feel special by giving them gifts, and an almost unhealthy amount of back hugs. He'd probably make some sentimental craft to symbolize the love you two share.
Namjoon's the ultimate boyfriend, to be honest. He takes great pride in his friends (so I'm guessing he would in his lover), and loves to make people feel loved. If any of the members were to execute some elaborate romantic display of his affection to the entire world, it'd be him to do so. Think: dedicating a love song on stage to you.Jin has talked more than once about different romantic activities he would like to do with his partner, particularly about taking them to interesting places. Thus, all of his romantic gestures would probably be centered around romantic settings. He's probably the type to blindfold his lover before taking them on a trip, so that the location would be a surprise for them.
Jungkook seems to want a picture perfect romance. He's expressed how he dreams about meeting a significant other and doing a bunch of stuff shown in sappy romance movies with them. I think if he were to do something, it'd be because he would want to experience it for himself. However, he'd do what he could to make it special for you too!
Yoongi would probably be a bit too shy to readily do romantic things for you, just because he doesn't always like to put his emotions out in the open. However, if you treat him well enough to get him to open up, he'd probably express his love for you through songs or poems. Whichever way he chose to be romantic, it'd be by showing his creative genius.
Hoseok doesn't act like he's very into sappy romance, so I don't think he'd be big on expressing his love with huge romantic gestures. He might find being overly romantic a bit suffocating at times, so I don't think he'd try to put on one of those displays that would make his partner cry from how thoughtful they thought that he was.
Taehyung is a sweetheart, but he doesn't seem like he's all that interested in romantic displays of affection. He may do thoughtful things for his partner, but I think it would be because of his care for them as a person, not his care for them as a lover. He wants to marry his best friend, so he'd probably end up showing most of his feelings for them in a less romantic way, in general.
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FanficThis can also be accessed at my Tumblr, bangtanofyourdreams. https://bangtanofyourdreams.tumblr.com/ Contains: One Shot imagines, MTLs, reactions, and a "describing" series. I TAKE REQUESTS! ...if I like the ideas given/haven't done something too...