Pet Alien (2004)

"Pet Alien" is a show about a 12 year old boy called Tommy Cadle who lives with five aliens in a lighthouse. The series takes place in the fictional town of DeSpray Bay where it follows Tommy's hectic life with five aliens from the planet Conforma who once crash-landed in his lighthouse and have stayed there ever since. Unlike most animated aliens living on Earth, the aliens in this cartoon don't wear disguises, but all the humans, except Tommy, are too ignorant to tell that they're aliens.