Colin

Colin is an eight-year-old Irish student whose family moved to Springfield and was a love interest of Lisa.

Biography
Colin revealed that he and his family have just moved to Springfield from Ireland and that his father is a musician, but strenuously denies it's from. His family is never seen but he did mention them. He also claims to be skilled in piano, guitar, trumpet, drums, and bass. Like Lisa, he has a keen interest in fighting pollution.

History
Colin and Lisa met coincidentally whilst trying to inform Springfieldians, in a door-to-door manner, of the pollution in Lake Springfield. They overhear one another and soon begin to finish each others sentences on pollution. Lisa calls him dreamy whilst speaking to the town about the pollution in Lake Springfield, which greatly annoys neighbors.

During the Trappuccino, due to an ensuing mob that comes after the Simpson family, Lisa was forced to leave Colin behind. As a goodbye Colin wrote a song entitled "Lisa's Song" which he performs with his guitar, but unfortunately she cannot hear due to the dome's thick glass wall. He then writes out the notes in marker on the glass so Lisa can understand the tune, which she does. After making sure Bart doesn't ruin the moment by punching him, she reluctantly leaves. Once Lisa returns to Springfield later on, Milhouse claimed that Colin died, making a poor mimic of his voice to try to get Lisa to hold his hand due to his own feelings for her. He then appeared to Lisa's delight and they walked off together to get some ice cream whilst holding hands.

He was seen on Main Street shortly after Trappucino, he was frightened by Bart who was riding on a skateboard.