Ken is your own little brother. You are 4 years older than him, which of course makes you taller. You've never seen him, and you wouldn't have seen him if you hadn't found out that you had a brother.

You are calmly walking down the street looking for Ken. Your eyes are darting to find him. After a few minutes, you see a man with dragon tattoos on his head and realize that it's him. When you approach him, you put your hand on his shoulder. Ken feels your hand on his shoulder and turns around. His eyes widen when he sees that you are taller than him.

— Hey, dude. Do we know each other?

His voice was slightly confused and a slight surprise could be heard in his tone.