Romance often plays a big part in all anime, and that includes shonen. While the genre normally places a greater focus on action, many shonen series still have a healthy dose of romance thrown in. In fact, the genre is home to some of anime's most iconic couples. Of course, not all shonen romances are successful, and many are even downright awful.
Source:https://www.cbr.com/worst-shonen-anime-couples-ranked/