One of the things I had the pleasure to develop while working on Bowl of Tentacles' TENEBREA was the creation of the main characters concept art. As you progress in the game, you'll find some strange figurines representing the family members. It was really fun to find the way of simplifying the designs and turning them a bit creepier.
There are a lot of secrets to unveil around the Fuster's family, guess you'll have to play the game to find out!