His name is Croo, and he is a retired
Croo is a character from Skyward Sword. He can be found in the Bazaar near the entrance. He will invite Link for a drink, and if Link says yes, he will explain more about the Knight Academy. He says there are Rescue Knights that save people from falling off of Skyloft, and tells Link that it takes much experience to become one, adding that his grandson is one of them. If Link denies Croo's offer to drink, Croo will be offended.