Lucas "Luke" Danes is the owner of Luke's Diner on Gilmore Girls. Luke starts off as friends with Lorelai but it's obvious he's in love with her and is just unable to express it due to outside circumstances such as Max.
During the season four finale, Lorelai and Luke kiss and they end up dating during much of season five until Christopher comes back intot he picture and marries Lorelai.
During season six, a 12 year old girl, April, arrives at his diner and turns out to be his daughter. During th series finale, it's implied that Luke ends up with Lorelai.