Lloyd is one of the many Kreylbone friends that Malcolm has. He is a bit of a wuss, and can never hold in a lie. He helped Malcolm and the other Kreylbone's build a killer robot for a competition. He is also active in all Kreylbone antics including the accident that made the Kreylbone's move out of there special room.
At one point in his life he was a goth, but that was only temporary because he was kicked out after they found out he was a kreylbone. He is seen many times throughout the series, he is also present during the birth of Jamie because he was trying to find Malcolm's notes.