The Kevin of the group 

Refers to someone in a group of friends who is less popular or not necessarily wanted/ needed in the friend group as much as others. The Kevin of the group is a reference to Kevin Jonas of the band the Jonas brothers, despite being talented he is often overlooked seeing as the spotlight is given to his brothers Nick and Joe. Kevin is often known as 'the other Jonas' or 'the forgotten Jonas'. Growing up Kevin was the one that no one really wants to date, but if your sisters had dibs on Nick and Joe you were forced to plan your dream wedding (that you totally wanted to be with anyone else but Kevin) with Kevin, well at least until you realized One Direction was a thing and it was unlikely that you had five sisters or friends so they were all free-dibs.

Ashley: Look at David trying so desperately to get the groups' attention
Samantha: I know, it's pathetic he may as well give up, he's obviously The Kevin of the group
Ashley: Oh, definitely

The Kevin of the group by All Payne No Liam December 25, 2020