Ah, Alex and Alec. They were both twins and were probably around 7 or 8 years old (They started showing up when I was 7). They had black hair Alex had a black shirt and white pants while Alec had a white shirt and black pants.
They weren't hostile or anything but they liked to play games, we played a lot of fun games like hide 'n seek and tag. They were always there I even saw them in my classroom a couple of times. I think my parents were worried since I was talking to myself and I didn't have much friends they disappeared when I was 9 though.