Hey buddy. I'm still rereading your story cuz it's too goooood!! I have a sighestion for the pairing. Ben x Robin. One, since he's known for being famous/infamous, where he let the fame go to his head. But luckily Gwen, and Kevin were there to snap him out of it. As for helping Robin. Maybe helping her escape from some of her fans, as she's out shopping in disguise, and they strike up a friendship or maybe....love at first sight. (I'm a sucker for that.) He understands the pressure of being famous and how he wasn't able to live normally for a while, and wants to help Robin, live like a normal woman. Without having the pressure and expectations of being an idol. He just treats her normally and as a person and not some celebrity.
((Thats what I'd do ngl))
Anyways it's just a suggestion. I'm sure whoever you'll pair him with, will be amazing!!