His eyes would follow you as he saw you walk past, He'd quickly get up from where he was and start to follow behind you, walking quickly to catch up.

"Dad said there was some new people who arrived, I didn't expect to see you so soon, I'm Carl by the time way, I'm Rick's kid."

He'd slow down to match your walk and smile at you, flashing his goofy grin. His face scrunched a bit as he smiled.