The boy seemed to gather his courage and come over to Layla and Charlotte.  He was a Gryffindor, and a muggleborn, and Charlotte was quite excited to hear that.

"Oh!" she was jumping a little in her excitement, "I'm a Gryffindor, a muggle born too!  You can sit with us... if it's alright with Layla.  I'm Charlotte."  She held a hand for him to shake.