Stuart David Bloom is the owner of The Comic Center of Pasadena, which the guys regularly visit, and their friend. He has a talent for drawing and is a graduate of Rhode Island School of Design. He also has an extensive knowledge on comic books and first appears in the season 2 episode “The Hofstadter Isotope”. He also acts as the competition when he dated Penny and Amy to help move other’s relationships forward.
Stuart starts bonding with his similarly lonely counterpart Raj at the start of Season 6, substituting for Howard when Howard has gone to space. He often seeks approval from Sheldon and his group. His actor, Kevin Sussman, was added to the main cast in season 6 with his credit at the opening when he was present in the episode; however, he was demoted back to the recurring status in “The Tangible Affection Proof” (S06E16), but had it restored at the start of season eight in “The Locomotion Interruption”. As of September 2015, Stuart has appeared on more episodes than Mrs. Wolowitz and is right behind series regular Amy.
He is helpful and kind-hearted, but due to his overworking schedule and underpaying job as comic book shop owner, he isn’t able to get out much and often gets depressed and struggles with financial issues.